Biographical note of the Editor-in-Chief:
Ethirajan Rathakrishnan (Born on May 25, 1953) is Professor of Aerospace Engineering at the Indian Institute of Technology Kanpur, India. He received the B.Sc. degree in Mathematics from the Madras University, India, in 1973, the M.Sc. and Ph.D. degrees in Aerodynamics and Gas Dynamics - Rarefied and Continuum Regimes from the IIT Madras, India, in 1978 and 1986, respectively.
He is well-known internationally for his research in the area of high-speed jets. The limit for the passive control of jets, called Rathakrishnan Limit, is his contribution to the field of jet research, and the concept of breathing blunt nose (BBN), which reduces the positive pressure at the nose and increases the low-pressure at the base simultaneously, is his contribution to drag reduction at hypersonic speeds.
He has published a large number of research articles in many reputed international journals. He is Fellow of many professional societies, including the Royal Aeronautical Society. Professor Rathakrishnan serves as the Editor-In-Chief of the International Review of Mechanical Engineering (IREME) journal.
He has authored 10 books: Gas Dynamics, 4th ed. (PHI Learning, New Delhi, 2012); Fundamentals of Engineering Thermodynamics, 2nd ed. (PHI Learning, New Delhi 2005); Fluid Mechanics: An Introduction, 3rd ed. (PHI Learning, New Delhi 2012); Gas Tables, 3rd ed. (Universities Press, Hyderabad, India, 2012); Instrumentation, Measurements, and Experiments in Fluids (CRC Press, Taylor & Francis Group, Boca Raton, USA, 2007); Theory of Compressible Flows (Maruzen Co., Ltd. Tokyo, Japan, 2008); Gas Dynamics Work Book 2nd ed. (Praise Worthy Prize, Napoli, Italy, 2013); Applied Gas Dynamics (John Wiley, New Jersey, USA, 2010); Elements of Heat Transfer, (CRC Press, Taylor & Francis Group, Boca Raton, USA, 2012) and Theoretical Aerodynamics, (John Wiley, New Jersey, USA, 2013).
RELEVANT CONTRIBUTIONS TO TECHNOLOGY
- A limit for jet control termed Rathakrishnan Limit is the contribution by Rathakrishnan to jet research (Rathakrishnan E., Experimental Studies on the Limiting Tab, AIAA Journal, Vol. 47, No. 10, October 2009, pp. 2475-2485).
- Positioned twin-vortices behind flat plate at Reynolds number as high as 5000 and brought out the physics behind this possibility at Reynolds number which is greatly lager than the limiting Reynolds number of around 160 reported by Von Karman for position twin vortices behind a circular cylinder.
- Introduced and demonstrated the concept of Breathing Blunt Nose (BBN), which decreases the high pressure at the nose and increases the low pressure at the base, resulting in considerable drag reduction, without any adverse effect, of a blunt-nosed body meant for hypersonic operation.
- Proved with quantitative and qualitative proof that the correctly supersonic free jet issuing a nozzle is wave dominated.
- Institutionalized the axial coordinate relation for Laval nozzle design.
- Demonstrated that the splitter plate to weaken the vortices at the base of a bluff body should be off-centered.
- Demonstrated that overexpanded jets can operate Hartmann-Sprenger tube as efficiently as underexpanded jets.
- Demonstrated that correctly expanded jets are also wave dominated.
AWARDS / HONOURS AND INVITATIONS
- Junior Fellow of International Center for Theoretical Physics, Triest, Italy: 1986.
- Best Teacher Award by the Utter Pradesh Publishers, India: 2000.
- Academic Excellence Award by International Friendship Society: 2002.
- Fellowship of International Aircraft Developments Funds (Japan) on the Theme: High Speed Jets:2002.
- Excellence in Aerospace Education Award; given by The President of India on Jan 21, 2003.
- Journal of Visualization Award, on September 18, 2007 at FSU, Tallahassee, FL, USA.
- Consultant to GSLV of Indian Space Research Organization for its Acoustics.
- Consultant designer of the 0.5 m by 0.5 m Hypersonic tunnel of Defence Research and Development Lab, Hyderabad, India.
- Invited Guest Scientist to International Centre for Theoretical Physics, Trieste, Italy, May–June 1986.
- Invited Speaker, Second National Conference on Aerodynamics, NAL, Bangalore, Dec 1986.
- Invited Speaker, IIT Bombay, Feb 1987.
- Invited Speaker, Tokyo Denki University, Japan, May 1992.
- Invited Speaker, Univ. of Tokyo, Japan, May 1992.
- Invited Speaker, VSSC, Trivandrum, June 1994.
- Invited Speaker, NATO Advanced Study Institute on Molecular Physics and Hypersonic Flows, Acquafredda Di Maratea, Italy, May–June 1995.
- Himanshu Agrawal (Ph.D Scholar) Invited to Chair a Fluid Dynamic Session, XX International Symposium of Space Technology and Science, Gifu, Japan, May 1996.
- K. Srinivasan (Ph.D Scholar) Invited to Chair a Fluid Dynamic Session, XX International Symposium of Space Technology and Science, Gifu, Japan, May 1996.
- Visiting Professor to Clarkson University, New York, USA from June 15 to Aug 15, 1996 to teach a course on Intermediate Fluid Mechanics in the Department of Mechanical Engg.
- Invited Speaker on Jet Acoustics, VSSC, Trivandrum, July 1997.
- Invited as Consultant to investigate the Acoustic load on the GSLV, VSSC, Trivandrum, March 1998.
- Invited to Chair a Fluid Dynamic Session, XXI International Symposium of Space Technology and Science, Omiya, Japan, May 1998.
- Invited to Chair a Students Session, XXI International Symposium of Space Technology and Science, Omiya, Japan, May 1998.
- Invited to deliver a lecture on, Passive control of jets,TokyoDenkiUniversity, Japan, May 28, 1998.
- Visiting Professor to Fluid Mechanics Research Laboratory, Dept. of Mechanical Engineering, Florida State University, Tallahassee, USA from July 16–25, 1998.
- Visiting Professor to Hyperschall Technologie Gottingen, Germany, December 1, 1998 to November 30, 1999.
- Invited to deliver a lecture on Experimental Techniques for Jet Noise Determination, on June 19, 1999, in the National Aerodynamics conference – 1999 (organized by the Aeronautical Society of India, Trivandrum Branch).
- Invited to deliver a lecture on, High Speed Jets form Nozzles with Crosswire, Tokyo Denki University, Japan, June 2, 2000.
- Invited to deliver a lecture on, Active Control of Base flows, Society of Mathematical Sciences, Tokyo Denki University, Japan, June 3, 2000.
- Best Teacher Award by UP chapter of publishers on September 5, 2000.
- Invited to deliver a lecture of High Speed Jet Control, Defence Research and Development Laboratory, Hyderabad, India, October 20, 2000.
- Invited to give a rapid course on Applied Gas Dynamics to the Scientists of DRDL Hyderabad, India. (August 2001).
- Invited to deliver a lecture on Supersonic Combustion, University of Tokyo, Japan, July 4, 2001.
- Invited to deliver a lecture on Isolators for Supersonic Combustion, Tokyo Denki University, Japan, July 6, 2001.
- Invited to deliver a lecture on High Speed Jets Indian Institute of Science, Bangalore, India, October 5, 2001.
- Invited to deliver a lecture on Jet Control 28th Fluid Mechanics and Fluid Power, Chandigarh, India, December 14, 2001.
- Invited to deliver a lecture on High Speed Jet Control Institution of Engineers India, Kanpur Centre, February 23, 2002.
- Invited to deliver an Institute lecture on Space and Missile Programs in India and IITK Contribution to them IIT Kanpur Students Gymkana, March 8, 2002.
- Invited to Chair a Fluid Dynamic Session, XXIII International Symposium of Space Technology and Science, Matsue, Japan, May 26-June 2, 2002.
- Invited by International Aircraft Development Funds as a Fellow on the theme “Research on Experimental Approach to Supersonic Jet and Its Acoustics” to visit leading Universities, Research Labs and Industries in Japan from May 26 to June 6, 2002.
- Invited to deliver a lecture on Vortex Theory by the Mathematical Society of Japan, Tokyo, Oct 12-20, 2002.
- Invited to deliver a lecture on Aero/Jet Acoustics by DRDL Hyderabad to DRDO Scientists, on Oct. 28, 2003.
- Invited to deliver Professor S Narasimhan’s Endowment lecture of Anna University Aero. Dept. at Madras Institute of Technology Campus of Anna University Aero. Dept. Chennai, March 8, 2004.
- Invited to Chair a Fluid Dynamic Session, 24th International Symposium of Space Technology and Science, Miyazaki, Japan, May 30-June 4, 2004.
- International Fellow Visiting Professor, University of Tokyo, Kashiwa, Japan, June-December 2006.
- International Fellow Visiting Professor, University of Tokyo, Kashiwa, Japan, June-July 2008.
- Invited lectures at on Compressible Flows, University of Tokyo, Kashiwa, Japan, June 2009.
- Invited lectures at on Jet Control, Tokyo Denki University, Tokyo, Japan, June 2009.
- Invited lectures at on Flow Visualization, Nigata University, Nigata, Japan, June 2009.
- Invited lectures at onWind Tunnels and Instrumentation, KMUTT, Bangkok, Thailand, July 2010.
- LIFETIME ACHIEVEMENT AWARD from SARES (International Sustainable Aviation and Energy Research Society), November 2021.
FELLOWSHIP/MEMBERSHIP IN PROFESSIONAL BODIES AND COMMITTES
- Fellow of Royal Aeronautical Society.
- Fellow of Aeronautical Society of India.
- Fellow of Institution of Engineers, India.
- Fellow of International Aircraft Development Funds, Japan on the theme “Research on Experimental Approach to Supersonic Jet and its Acoustics”
- Associate Fellow, American Institute for Aeronautics and Astronautics, USA.
- Life member Indian Society for Technical Education.
- Member of FLUCOME Society.
- Member ISAIF.
- Member, Accreditation and Examination Committee of Aeronautical Society of India, Apr 95 to Mar 96, Apr 96 to Mar 97.
- Member, National Accreditation Committee Al l Indian Council of Technical Education.
- Member, Academic Committee of Aeronautical Society of India.
- Council Member of Aeronautical Society of India, 2004.
KEYNOTE LECTURES/INAUGURAL ADDRESS
- Delivered the Inaugural Address and Keynote Lecture at the 100 Years of Aviation Celebrations, of Anna University Aero. Dept. at Madras Institute of Technology Campus, Chennai, Feb. 21-22, 2003.
- Keynote Lecture at the Eighth Asian Symposium on Visualization in Chiangmai Thailand, May 23-27, 2005.
- Keynote Lecture at theWorkshop on GAS DYNAMICS and Its APPLICATIONS, Koneru Lakshmaih College of Engineering, Nagarjuna University, Andhrapradesh, India, November 7-8, 2005.
- keynote Lecture on ”Physics of Rathakrishnan Limit for Jet Control” at the 9th Asian Symposium on Visualization, Hong Kong, June 4-8, 2007.
- Inaugurated the School of Mechanical Engineering and delivered Inaugural Address, Koneru Lakshmiah College of Engineering, Nagarjuna University, Andhrapradesh, India, September 10, 2007.
- Resource Person for Short Term Course on GAS DYNAMICS for Engineering Faculty and Scientists, May 12-17, 2008, Tagore Engineering College, Chennai.
- Keynote Lecture on “Corrugated Tabs for Supersonic Jet Control” 10th FLUCOME conference, Moscow, August 21, 2009.
- Visiting Professor, Frontier School of Engineering Sciences, The University of Tokyo, Kashiwa, Japan, December 20, 2010 to December 19, 2011.
- Keynote Lecture on “Corrugated Limiting Tab for Jet Mixing”, Invitation Letter to the 13th International Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines, Sep. 11-14, 2012, Tokyo, Japan.
- Keynote Lecture on “Triangular tabs for supersonic jet mixing enhancement”, The 2nd symposium on Fluid-Structure-Sound Interactions and Control (FSSIC2013), May 20-23, 2013, Hong Kong.
- Keynote Lecture on “ Mixing Promoting Effciency of Three Different Tab Geometries” 12th FLUCOME conference, Nara, Japan, November 18-23, 2013.
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