Method for designing fixed-geometry two-dimensional mixed-compression type supersonic velocity air inlet channel

Abstract

The invention discloses a method for designing a fixed-geometry two-dimensional mixed-compression type supersonic velocity air inlet channel. A basic structure of the adopted two-dimensional mixed-compression type air inlet channel comprises an outer pressing section, an inner pressing section, a throat section, an expanding section and a lip. The lip is of a sharp plate structure with a certain wedge angle. When the air inlet channel is designed, designed starting Mach number is improved appropriately, the lip shape is changed, and the starting mach number is effectively reduced to be lower than a requested value through a certain flow on the premise that the flow requirement of the air inlet channel is met. By means of the method, the requirement for starting performance can be met, contraction ratio of the air inlet channel can be increased in design, and accordingly high back pressure resisting capability and low outlet Mach number are obtained in a wide working range to facilitate efficiently combusted organizations in a combustion chamber. Furthermore, small total pressure loss in the working process of the air inlet channel can be achieved through the change of the lip shape. The method for designing the fixed-geometry two-dimensional mixed-compression type supersonic velocity air inlet channel has good actual application value.

Description

technical field [0001] The invention relates to a design method for the intake port of a ramjet engine, in particular to a design method for a fixed-geometry binary mixed-pressure supersonic intake port. It is especially suitable for the design of the intake port of the sub-combustion ramjet engine. Background technique [0002] For sub-combustion ramjet engines with a high working Mach number, such as solid-impact engines, the binary mixed-pressure inlet is widely used as the inlet form because of its simple structure, good angle of attack characteristics and lift-drag characteristics. one. [0003] The existing published literature "Design and Research of Wide Mach Number Solid Impulse Binary Inlet" ("Acta Astronautics", Vol.29, No.5, 2008, 1577-1582) and "Optimum Design for 2-D Inlet Working In Condition of Large Angle of Attack" (AIAA 2009-36, 2009) and other papers, the general design method of fixed geometry binary mixed-pressure inlet is based on the classic Oswatit...

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Problems solved by technology

However, the binary mixed-pressure inlet designed by these methods can obtain better performance near the design point, but it is often difficult to obtain better performance in a wide operating range.

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