Characteristics of Parallel and Inward Canted Sonic Twinjets
Twin unventilated sonic jets of parallel and inward canting configurations with non-dimensional inter-nozzle spacing of 3, 4 and 5 were studied experimentally at different levels of underexpansion corresponding to nozzle pressure ratio (NPR) of 3, 5 and 7. The results of measured pitot pressure distribution show that, for parallel twinjet with inter-nozzle spacing of 4 and 5, the merging point shifts downstream with increase of NPR, whereas for inter-nozzle spacing of 3, the merging point moves upstream with increasing NPR. For inward canted twinjet, the merging point shifted upstream compared to parallel twinjet at all the NPRs and inter-nozzle spacings studied. The shifting of merging point and the maximum centerline pressure level are strongly influenced by inter-nozzle spacing. For inter-nozzle spacing of 3, the inward canted twinjet confluences completely at about 20 diameters, whereas the parallel twinjet confluences only around 30 diameters. With increase of inter-nozzle spacing from 3 to 5, the confluence is slightly delayed for both the twinjets. The shadowgraph pictures confirmed the presence of Mach disk at NPRs 5 and 7 for all the twinjet configurations.
Copyright © 2018 Praise Worthy Prize - All rights reserved.
Krothapalli, A., Baganoff, D., and Karamcheti, K., Development and Structure of a Rectangular Jet in a Multiple Jet Configuration, (1980), AIAA Journal, Vol. 18, pp. 945–950.
Raghunathan, S., and Reid, I. M., A Study of Multiple Jets, (1981) AIAA Journal, Vol. 19, pp. 124–127.
Moustafa, G.H., and Rathakrishnan, E., Studies on the Flowfield of Multijet with Square Configuration, (1993) AIAA Journal, Vol. 31, pp. 1189-1190.
Lamb, J.P., Abbud, K. A., and Lenzo, C. S., A Theory for Base Pressures on Multinozzle Rocket Configurations, (1970) Journal of Spacecraft and Rockets, Vol. 7, pp. 451–457.
Pani, B., and Dash, R., Three-Dimensional Single and Multiple Free Jets, (1983) Journal of Hydraulic Engineering, Vol. 109, pp. 254–269.
Miller, D. R., and Comings, E. W., Force-Momentum Fields in a Dual-Jet flow, (1960) Journal of Fluid Mechanics, Vol. 7, pp. 237–256.
Tanaka, E., The Interference of Two-Dimensional Parallel Jets: 1st Report, Experiments on Dual Jet, (1970) Bulletin of JSME, Vol. 13, Issue 56, pp. 272-280.
Tanaka, E., The Interference of Two-Dimensional Parallel Jets: 2nd Report, Experiments on the Combined Flow of Dual Jet, (1974) Bulletin of JSME, Vol. 17, Issue 109, pp. 920–927.
Lin, Y. F., and Sheu, M. J., Interaction of Parallel Turbulent Plane Jets, (1991) AIAA Journal, Vol. 29, No. 9, pp. 1372–1373.
Okamoto, T., Yagita, M., Watanabe, A., and Kawamura, K., Interaction of Twin Turbulent Circular Jet, (1985) Bulletin of JSME, Vol. 28, Issue 238, pp. 617-622.
Rathakrishnan, E., Vijay Bhaskar Reddy, and Padmanaban, K., Some Studies on Twin Jet Propagation, (1989) Journal of Mechanics Research Communications, Vol. 16, Issue 5, pp. 279–287.
Kantola, R. A., Acoustic Properties of Heated Twin Jets, (1981) Journal of Sound and Vibration, Vol. 79, Issue 1, pp. 79–106.
Norum, T. D., and Shearin, J. G., Dynamic Loads on Twin Jet Exhaust Nozzles due to Shock Noise, (1986) Journal of Aircraft, Vol. 23, No. 9, pp. 728-729.
Seiner, J. M., Manning, J. C., and Ponton, M. K., Dynamic Pressure Loads Associated with Twin Supersonic Plume Resonance, (1988) AIAA Journal, Vol. 26, No. 8, pp. 955–960.
Wlezien, R. W., Nozzle Geometry Effects on Supersonic Jet Interaction, (1989) AIAA Journal, Vol. 27, No. 10, pp. 1361-1367.
Leonard Shaw, Twin-Jet Screech Suppression, (1990) Journal of Aircraft, Vol. 27, No. 8, pp. 708-715.
Junhui Gao, Xin Xu, and Xiaodong Li., Numerical Simulation of Supersonic Twin-Jet Noise with High-Order Finite Difference Scheme, (2018) AIAA Journal, Vol. 56, No. 1, pp. 290-300.
Elbanna, H., and Sabbagh, J. A., Flow Visualization and Measurements in a Two-Dimensional Two-Impinging Jet Flow, (1989) AIAA Journal, Vol. 19, No. 4, pp. 420–426.
Rajaratnam, N., and Khan, A. A., Intersecting Circular Turbulent Jets, (1992) Journal of Hydraulic Research, Vol. 30, Issue 3, pp. 373–387.
Disimile, P. J., Savory, E., and Toy, N., Mixing Characteristics of Twin Impinging Circular Jets, (1995) Journal of Propulsion and Power, Vol. 11, No. 6, pp. 1118–1124.
Elangovan, S., Solaiappan, A., and Rathakrishnan, E., Studies on Twin Non-Parallel Unventilated High-Speed Jets, (1997) Journal of Aerospace Engineering, Vol. 211, Issue 5, pp. 337–353.
Mohana Murali, Lovaraju, P., and Rathakrishnan, E., Characteristics of Sonic Twin jets with Outward Canting, (2006) 24th AIAA Applied Aerodynamics Conference, Fluid Dynamics and Co-located Conferences, San Francisco, California, AIAA 2006-3675.
Rathakrishnan, E., Applied Gas Dynamics, (Wiley, Hoboken, New Jersey, 2010).
Rathakrishnan, E., Instrumentation, Measurements, and Experiments in Fluids, 2nd Edition, (CRC Press, Boca Raton, Florida, 2017).
- There are currently no refbacks.
Please send any question about this web site to email@example.com
Copyright © 2005-2021 Praise Worthy Prize