Processing method of shock tunnel high Mach number throat channel inner profile

Abstract

The invention relates to a processing method of a shock tunnel high Mach number throat channel inner profile. Theprocessing method is characterized by comprising the steps that step 1, an inner hole is drilled, wherein the diameter of the inner hole is smaller than that of a throat hole, and the inner hole is used as a turning bottom hole; step 2,rough turning is carried out, excess materials arequickly removed, and preparation is made for finish turning; step 3, finish turning is carried out, an area far away from the throat hole and with larger diameter of the profile is subjected tofinish turning to the required final size; an area,close to the throat hole,with smaller profile diameter is subjected tofinish turning to leave a machining allowance of about 0.15 mm; and step 4, reaming iscarried out, a forming reamer isused for processinga throat channelto the final profile requirement.The processing method processes the inner profile near the throat hole by using the forming reamer,the seriousreamer back-off problem in the turning process is avoided, the processing precision is improved, the high-precision processing problem of the inner profile of a shock tunnel high Mach number throat channel is solved, and the flow field quality is improved.

Description

Technical field [0001] The invention relates to a method for processing the inner profile of a high Mach number throat in a shock wind tunnel, belonging to the field of hypersonic shock wind tunnel engineering. Background technique [0002] The shock tunnel is a special hypersonic wind tunnel. The shock tunnel uses the compression of shock waves to increase the total temperature of the wind tunnel. The shock tunnel has a simple structure and relatively low cost. With modern testing The development of technology can undertake most of the hypersonic aerodynamic and aerodynamic thermal measurement tests, and it plays an increasingly important role in the development of new models of aerodynamic shapes. Shock wave wind tunnel nozzles are pipe fittings that produce hypersonic airflow. Because the nozzles are long, they are generally processed in sections. The inner profile of the throat section of the nozzle shrinks and then expands, which affects the quality of the wind tunnel flow f...

AI Technical Summary

Problems solved by technology

The position with the smallest diameter in the throat is called the throat hole, which is generally processed by turning. During the processing, due to the small diameter and deep depth, there is a serious phenomenon of tool give-up, and the final processing accuracy and roughness are difficult to guarantee.

[0003] The airflow passing through the throat of a high Mach number nozzle usually has a high enthalpy value (above 4000K), which requires higher resistance to ablation and erosion resistance of the throat. The current solution often uses high-temperature-resistant metals. Such as tungsten-zirconium-molybdenum alloy, expensive

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