Engineering Transactions, 35, 2, pp. 217-227, 1987

A Study on Matching Problems of Supersonic Two-Dimensional Air Inlets

I.A. Fakhary
Al-Fateh University, Tripoli

T.G. Pai
Al-Fateh University, Tripoli

In order to ensure a uniform and stable compressor face flow, maximum total pressure recovery and minimum pre-entry drag for an Air Inlet of a supersonic aircraft of flight Mach numbers above 2, over its entire flight range and variable geometry, is a necessity. The variable multi-ramp external compression two-dimensional Air Inlet is one of the most attractive solutions for this case, where variable geometry may be easier to engineer [1]. In this paper two developed computer programs (GMTRY and CRIT) are presented. OSWATITSCH [2] optimum ramp angles are used to determine the geometrical shape of the three ramp variable deflection Air Inlet, and the exact solution of the shock wave equation is utilised to determine a number of parameters relevant to the Air Inlet performance at design and critical operational conditions. Flow shape and flow pattern at critical, sub-critical and Ferri limit of the air inlet under study are presented.

Full Text: PDF


L. E. SURBER and C. B. ROBINSON, Survey of inlet development for supersonic tactical aircraft; AIAA/SAE/ASME 19th Joint Propulsion Conference; June 27-29, Seattle, Washington, AIAA 831164, 1983.

K. OSWATITSCH, Pressure recovery for missiles with reaction propulsion at high supersonic speeds, NACA TM1140, June 1947.

J. DUNHAM, lntake design for fighter aircraft, National gas turbine establishment, Memo no. M77020, Dec. 1977.

R. HURD, Supersonic inlets, AGARD CP 109, 1969.

T. G. PAI, Subcritical performance of external compression supersonic air intakes, Publ. Indian Inst. Technology, Report no. AE TR 821201, Dec. 1982.

I. MC GREGOR, Same theoretical parameters relevant to the pe1formance of rectangular ai intakes with double ramp compression surfaces at supersonic speeds, Royal Aircraft Establishment, Technical Report no. TR71232, 1971.

I. A. FAKHRY, Matchning problems of two-dimensional supersonic Air Inlet with aeroengines, Pb. D. Dissertation, California Coast University, USA, 1985.

Copyright © 2014 by Institute of Fundamental Technological Research
Polish Academy of Sciences, Warsaw, Poland