Supersonic gas ejector

Abstract

The invention discloses a supersonic gas ejector. The supersonic gas ejector comprise a gas inlet barrel, a fuel nozzle, an igniter, an ejector housing, a combustion device and a diffusion device, wherein the ejector housing sleeves the outer surface of the air inlet barrel, and a cavity is formed between the ejector housing and the air inlet barrel; the combustion device is arranged in the cavity; the combustion device comprises a combustion barrel and a spray tube; the igniter is connected to the combustion barrel through the ejector housing; the spray tube is connected to the back end of the combustion barrel; and the diffusion device is connected to one end of the ejector housing. The device disclosed by the invention employing high-temperature gas expansion is high in thermal efficiency, suitable for long-term operation, simple in structure, easy to process and low in manufacturing cost.

Description

technical field [0001] The invention relates to the field of fluid machinery, in particular to a supersonic gas ejector. Background technique [0002] An ejector is a fluid machine that creates a low pressure environment through the expansion of a gas to suck another fluid. Conventional hypersonic wind tunnels use air ejectors to generate a low-pressure environment in the test chamber, and discharge the low-pressure test gas into the atmosphere. According to the different ejection gas media, commonly used ejectors include air ejectors, steam ejectors, etc. device, gas injector. [0003] The air ejector uses compressed air to accelerate through the nozzle to generate gas expansion. Because it is a cold flow, when the Ma number is high, the air flow will condense, and the efficiency is relatively low. [0004] The steam ejector requires a steam boiler and a long heat pipe system, the equipment is huge, and the flow rate of the ejection system is large. It is necessary to bui...

AI Technical Summary

Problems solved by technology

Make full use of heat energy to generate gas expansion, high efficiency, but the existing gas ejector is limited by the structural form, it is difficult to install a cooling device, and the time for reliable operation is very short

For example, the gas flow wind tunnel uses the gas ejector, which uses the injection combustion method of the rocket engine, uses the mixture of alcohol and oxygen for combustion, generates the total pressure, accelerates through the expansion of the nozzle, and generates the main air flow of the ejector. The injection efficiency is relatively high, but it is difficult to adopt cooling measures for the structure of the ejector shell parts. Generally, the heat capacity of the metal parts and the short running time are used to ensure safety. The running time is short, and the combustion parameters are difficult to adjust in real time. Convenience, but also unable to meet the long-term operation of wind tunnel equipment

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