Ejectors for engine test bench exhaust systems

Abstract

The invention discloses an ejector for an engine test platform exhaust system. A low-pressure chamber, a transition section, a blending convergence section, a blending equal-straightness section and a blending expansion section are coaxially and fixedly connected with one another sequentially according to the flowing direction of an injected gas flow; an injected gas flow input section, an injected gas flow convergence section, an injected gas flow equal-straightness section and an injected gas flow expansion section are coaxially and fixedly connected in the low-pressure chamber sequentially according to the flowing direction of the injected gas flow; the low-pressure chamber, the transition section, the blending convergence section, the blending equal-straightness section, the blending expansion section, the injected gas flow input section, the injected gas flow convergence section, the injected gas flow equal-straightness section and the injected gas flow expansion section are hollow rotary bodies; the injected gas flow input section is coaxial with the low-pressure chamber; and the outlet section of the low-pressure chamber and the outlet section of the injected air flow expansion section are located on the same vertical plane. The ejector of the invention has high ejecting performance, and thus, with the ejector adopted, test efficiency can be improved, and test cost can be reduced.

Description

technical field [0001] The invention relates to an ejector, in particular to an ejector used for the exhaust system of an engine test bench. Background technique [0002] When simulating the high-altitude flight state of the engine on the ground, the engine is usually installed in the high-altitude simulation cabin first, and the high-altitude simulation cabin is pumped with air extraction equipment so that the pressure in the high-altitude simulation cabin is the same as the ambient pressure at the altitude of the engine when it is flying at high altitude. In the same way, the engine is ignited and the high-altitude flight simulation test is carried out. During the test, the pressure in the high-altitude simulation cabin must always be kept the same as the ambient pressure at the altitude of the engine when it is flying at high altitude. This requires the exhaust gas from the engine to be discharged to high altitude immediately In the simulation cabin, in the prior art, an ...

AI Technical Summary

Problems solved by technology

[0002] When simulating the high-altitude flight state of the engine on the ground, the engine is usually installed in the high-altitude simulation cabin first, and the high-altitude simulation cabin is pumped with air extraction equipment so that the pressure in the high-altitude simulation cabin is the same as the ambient pressure at the altitude of the engine when it is flying at high altitude. In the same way, the engine is ignited and the high-altitude flight simulation test is carried out. During the test, the pressure in the high-altitude simulation cabin must always be kept the same as the ambient pressure at the altitude of the engine when it is flying at high altitude. This requires the exhaust gas from the engine to be discharged to high altitude immediately In the simulation cabin, in the prior art, an ejector is usually used for air extraction, and the ejector uses a relatively high-pressure ejector airflow to eject a low-pressure (or no-pressure) ejected airflow to complete the ejected airflow suction. The device for mixing, injecting or transporting the air flow, because the ejector has no moving parts, is reliable in use, and is widely used in the exhaust system of the engine test bench; and for the ejection part that provides the ejection airflow and the blending part of the blending injection The geometric and positional relationship of the ejector is the key factor to determine the performance of the ejector, but in the prior art, there is no mature and reasonable relationship between the ejector part and the blending part for the ejector of the exhaust system of the engine test bench. Geometric and positional relationships lead to poor ejector performance, which reduces test efficiency and increases test costs

Images