A laser method for reducing heat load and wave resistance caused by type IV shock waves

Abstract

The invention provides a method for controlling IV shock wave interference to reduce heat load and wave impedance through use of the technology of loading a breakdown flow field with laser energy to form quasi-static wave. The method comprises a step of pre-estimating the position and strength of IV shock wave interference, a step of shaping a laser beam into a light sheet, a step of forming quasi static wave, and a step of controlling IV shock wave interference to achieve heat insulation and impedance reduction. In the first step, an NS equation is solved and a flow field is numerically simulated, or wind tunnel test is carried out according to the Mach and Renault similarity criterion, and whether IV shock wave interference occurs in the flow field and the position and strength of IV shock wave interference are judged; in the second step, a laser beam is shaped into a light sheet by using multiple reflector and lens combinations; in the third step, the size, position and frequency of laser energy injection are optimized to form quasi static wave; and in the fourth step, the quasi static wave and the IV shock wave interference interact with each other, arch shock wave is distorted, quasi static wave is formed near the surface of a blunt body, and thus, integration of heat insulation and impedance reduction is realized.

Description

technical field [0001] The invention belongs to the field of main control flow control, and is a device for reducing heat load and wave resistance of supersonic and hypersonic aircraft. Background technique [0002] Shock wave interference is also a common phenomenon in supersonic and hypersonic flight, especially type IV interference of oblique shock wave and bow shock wave, which has a profound impact on aircraft performance. In 1968, Edney identified six different types of disturbances based on the difference in the relative positions of the incident shock wave and the bow shock wave, among which Type IV produced a supersonic jet in which the flow was efficiently compressed and tangent or tangent to the leading edge The collision produced significant ballast and heat loads on the surface of the blunt body. A. Wieting's research shows that the peak pressure and heat flow generated when there is type IV shock wave interference are 20-40 times that of the bow shock wave, an...

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Problems solved by technology

[0004] The laser-controlled type IV shock wave interference work at home and abroad has proved the feasibility of this method, but the current laser energy injection method is limited to single pulse, and the purpose of control is to reduce ballast and heat load, and does not reduce wave resistance. within consideration

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