Category: Science and Technology

  • Technology, Politics and China’s Quest for Energy Dominance

    Technology, Politics and China’s Quest for Energy Dominance

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    Abstract:

    This paper will empirically investigate the role of technology in international politics through a case study of China’s development of renewable energy infrastructure (solar PV and wind energy) and its impact on international politics. This paper looks at how technology helps shape a state’s identity using renewable energy technology as an explanatory variable. The paper employs Grygiel’s Model of Geopolitics to analyse the case study; geopolitics because much of China’s development in the renewable sector has been a function of its geography and abundance of natural resources.

    Introduction:

    China has experienced decades of near double-digit economic growth and since the 2000s, has witnessed a growing population and rapid industrialization that has correspondingly driven demand for energy. Its expeditious implementation of economic reforms has elevated it to the status of a global power capable of challenging the US-established status quo. Stability is increasingly being viewed as a function of China’s behaviour vis-à-vis its strategic rivals, primarily the US, and to a lesser extent Japan, India, Russia and the littoral states of Southeast Asia. But more importantly, it has been China’s near fanatic fervour to rise as a technologically superior state, as the US emerged post the World Wars, that has generated interest. The modernization of its military, near the meteoric rise of installed capacities for renewable sources of energy and technological revolution, underscores the importance and role technological advancement plays in a state’s development. Technology and international politics have a near symbiotic relationship and the former has the potential to fundamentally alter the way states exercise their sovereignty in pursuit of their national interests.

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  • Retrofit Winglets for Wind Turbines

    Retrofit Winglets for Wind Turbines

    Retrofit Winglets for Wind Turbines

    Vijay Matheswaran1 and L Scott Miller2
    Wichita State University, Wichita, KS 67260
    Patrick J Moriarty3
    National Renewable Energy Laboratory, Golden, CO 80401

    The benefits of using winglets on wind turbines has been well documented. However, adding winglets to wind turbine blades leads to significant increases in blade root bending moments, requiring expensive structural reinforcement with cost and weight drawbacks. A unique design philosophy for retrofitting winglets on existing wind turbines is presented. These retrofit winglets offer an increase in power produced without the need for structural reinforcement. Predicted performance and cost benefits are illustrated via a study using the NREL 5MW reference wind turbine. The addition of winglets resulted in a 2.45% increase in Coefficient of Power (Cp) and 1.69% increase in Annual Energy Production (AEP).

    Nomenclature

    Cp = coefficient of power

    V¥ = freestream velocity

    𝑟i = blade section radius

    𝜃t = blade section twist

    𝐼$ = Initial Cost per year

    𝑀$ = Annual Operating Expense

    Et = Annual Energy Output

    I. Introduction

    The idea of winglets on wind turbines is one that has been periodically explored in the past few decades. The earliest studies incorporating blade tip devices on wind turbines were done by Gyatt and Lissamann1. Drawing from advanced tip shapes that were being applied to fixed wing aircraft to reduce drag, the authors tested four tip designs on a 25kW Carter Wind Turbine in San Gorgonio Pass, California. Further studies were carried out in subsequent decades. Van Bussel2 developed a simple momentum theory for blade winglet configurations. Imamura et al.3 analyzed the effects on winglets on wind turbines using a free-wake vortex lattice method. Guanna and Johansen4 developed a free wake lifting line model to compute the effects of winglets, comparing it with CFD results obtained using EllipSys3D. Johansen and Sorenson5 did further studies on increasing power coefficient with the use of winglets, showing that adding winglets definitely changes the downwash distribution, leading to an increase in the power produced by a wind turbine.

    While the benefit of adding winglets has been well documented, there are drawbacks to adopting the traditional method of doing so. The addition of large, heavy winglets to maximize aerodynamic benefit leads to significant increases in root bending moments. Imamura et al.6 analyzed the effects of winglets on wind turbine blades using a free-wake vortex lattice method. Their study showed that a winglet at an 80°cant angle and height of 10% of the rotor radius resulted in a 10% increase in the blade root flapwise bending moment. This situation may require blade structural reinforcement, making winglets an expensive and often infeasible proposition. In order to address this, a novel design philosophy has been developed, allowing the use of retrofit winglets that offer an increase in power produced, but without the need to structurally reinforce the blade. This paper outlines the design philosophy, tools

    used and results from initial simulations.

    II. Design Philosophy for Retrofit Winglets

    The key differentiator between this study and prio winglet studies is the design philosophy: designing a lightweight winglet at minimum cost that, while providing an improvement in the turbine’s Coefficient of Power (Cp), does not require blade structural reinforcement. Such a winglet does not seek to maximize Cp, but rather minimize blade bending moments with an acceptable increase in Cp. This is accomplished by balancing the centrifugal force and aerodynamic normal force generated by the winglet. Balancing forces minimizes increases in blade root bending moment, negating the need for an exceptionally strong winglet and allowing it to be light, and requiring noreinforcement of the main blade. Savings in weight are strongly related to cost, so a lighter winglet implies a cheaper, more cost effective one. Accordingly, the best winglet is not one that offers the maximum increase in Cp, but rather offers an increase in Cp while ensuring forces are balanced within a threshold. Figure 1 presents a freebody diagram of the retrofit winglet. A qualitative plot highlighting the design philosophy and the optimal design space is presented in Figure 2. To be able to guage the effects of winglets developed using the mentioned design philosophy, it was decided to use the NREL 5MW wind turbine7 as a reference turbine, and implement a vortex lattice method and cost function to evaluate aerodynamic efficacy and feasibility. The NREL 5MW reference wind turbine is a conceptual three-bladed upwind turbine that was primarily designed to support concept studies. It is heavily based on the Repower 5MW wind turbine; however, in cases where detailed information is not available, data from publicly available conceptual studies is used.

    1 PhD Candidate, Department of Aerospace Engineering, AIAA Student Member

    2Professor and Chair, Department of Aerospace Engineering, AIAA Associate Fellow

    3Team Lead, Wind Plant Aerodynamics, AIAA Member


    Click here for access to the Paper

  • To Become Atmanirbhar, Bharat Needs Strong R&D

    To Become Atmanirbhar, Bharat Needs Strong R&D

    India has gone full circle from Gandhi’s days of Swadeshi to Nehru’s vision of self-reliant India to New Economic Policies of indiscriminate opening of the economy to Atmanirbhar Bharat. In between lip service was paid to Swadeshi in 1998 but the government continue with the indiscriminate opening up of the economy. Even agriculture was not left untouched with the opening up of 1400 commodities after the Seattle round of negotiations in 1999.

    What is Atmanirbharta?

    What do we understand by atmanirbhar – is it at the narrow level of producing most things that we need ourselves or at the wider philosophical level? If the latter, it implies independence of thought and development of socially relevant knowledge. It could lead to an alternate vision of development and prosperity for the nation.

    In an open economy people will then buy the foreign produced cheaper goods. So, the more important aspect of atmanirbharta is the philosophical aspect.

    The idea of producing most things ourselves runs into a contradiction in a globalizing world which is premised on marketization. Most things are being produced cheaper and better somewhere else, including our cultural symbols such as gulal, diyas and ganesh statue. In an open economy people will then buy the foreign produced cheaper goods. So, the more important aspect of atmanirbharta is the philosophical aspect.

    Opening up the Economy

    In 1991, with the New Economic Policies we gave up the idea of ourselves producing most things that we need. Our global trade increased dramatically with the percentage of export plus import of goods and services in GDP rising from around 17% in 1991 to about 55.8% by 2013. In 2019 it is down to about 40%.

    With the evolution of Washington Consensus in the 1980s, based on the idea of marketization, the world started to integrate in the 1990s with all countries showing a sharp rise in trade to GDP ratio. China captured a large share of the world markets and built a huge trade surplus. Its foreign exchange reserves rose to over $3.5 trillion. This gave it enormous clout globally not only with developing countries but also with the developed countries.

    The idea of atmanirbharta or self-reliance underwent a change. It became a matter of global competition to gain market share globally. One imported more to export more. Growth was supposed to depend on this. South East Asia and China were given as examples of success of such openness and rapid improvement in the living standard of the population. China post-Mao successfully adopted such a strategy. It was a large economy so it could not even be said that India cannot do what Singapore can do.

    Globalization is all about development of technology and India has lagged behind in that.

    Lessons from China

    What are the lessons India can learn from China’s achievements in the last thirty years? Apart from the fact that it is an authoritarian state with a strong sense of nationalism, its advances in research are stupendous.

    China has invested huge sums in building a strong infrastructure and research base in Universities, Institutions and Industry. It has one of the highest investment and savings rate in the world at 44 per cent in 2019. India’s comparative figure for 2019 is around 30%. It has developed the 5G technology faster than others and is willing to provide it cheaper than its competitors. This is also the case with many other lines of production such as, electronics, pharmaceuticals, automobiles and toys. It has moved rapidly in various fields such as development of artificial intelligence and applications of internet for commerce and financial sectors.

    Globalization is all about development of technology and India has lagged behind in that.

    China has had the long term vision to develop this rapidly by investing heavily in Research and Development. After getting technology from foreign companies, it has advanced the same by mastering it. Unfortunately, India has not done so and has repeatedly imported the next level of technology.

    Need for strong R&D

    India’s investment in R&D has been minimal. The private sector has been investing little in technology development. And, the public sector has been hamstrung in technology development by lack of autonomy, bureaucratization and corruption.

    Global competitiveness requires rapid development of technology. It requires massive investment in both absorption and development of technology. Instead, India’s investment in R&D has been minimal. The private sector has been investing little in technology development. And, the public sector has been hamstrung in technology development by lack of autonomy, bureaucratization and corruption.

    Research and Development require autonomy for researchers and a long term vision. Of course resources are also required but autonomy and vision are crucial and these have been weak in India. The same Indian researchers are able to do well in foreign lands but when in India they are not able to deliver. Our research establishment are rather feudal in approach and work within rigid hierarchies so that often talent gets suppressed.

    a culture of promoting independent and critical thinking is largely missing and that reacts back on research and generation of new ideas.

    Universities are the places where autonomy is greater and a long term vision can flourish away from the immediate profit motive. But unfortunately most of our universities are also bureaucratized and do not give autonomy to the academics. The authorities largely with bureaucratized and feudal mindset see independent thinking as a threat to themselves and, therefore, put up road blocks in the path of the independent thinkers thereby frustrating them and making their functioning difficult. Often the independent minded are seen as trouble makers and a challenge to the domination of the authorities. This is true not only in social sciences but also in the case of sciences in most universities. Thus, a culture of promoting independent and critical thinking is largely missing and that reacts back on research and generation of new ideas.

    Imperatives of Strengthening R&D

    Atmanirbharta in the present day world does not imply closing the economy but having the strength to face the challenge from other nations. This has to be based on a long term vision and cannot be achieved in the short run or by ad hoc measures.

    It requires high quality education right from the school stage. Thus, the education budget has to be expanded and teaching paid much higher attention than given at present. The status of teachers has to be enhanced so that talented people come in to academia.

    The world has been globalizing for thousands of years with trade and exchange of knowledge across nations and across continents. But earlier it was a slow two way process. Colonization turned into a one way process with western knowledge and thought establishing its hegemony globally and more so in India. That killed the internal dynamism of Indian society. It reinforced feudalism in India and decimated the quest for socially relevant knowledge generation.

    There has to be a continuum in knowledge generation but with an Indian perspective. India has to have the self-confidence that it can move ahead without denying the last few hundred years. Denial is only a sign of weakness.

    As Gandhi suggested, there is need for Indian modernity. Achieving that is crucial. Can it be based on denying what has happened over the last 250 years and going to what existed prior to that? Such a gap would undermine our understanding of social developments in India. That would be a recipe for repeating our mistakes. There has to be a continuum in knowledge generation but with an Indian perspective. India has to have the self-confidence that it can move ahead without denying the last few hundred years. Denial is only a sign of weakness.

    Denial would prevent us from understanding the nature of globalization we are undergoing and therefore we would not be able to work out any correctives that are needed. It would lead to much confusion in society. For instance, we would not be able to understand why consumerism is sweeping the world, including the poor in India or why our research lacks dynamism. In brief, Atmanirbharta requires India to move with self-confidence and not be in denial.