High-altitude and low-pressure characteristic simulation test station of air compressor in internal-combustion engine

Abstract

The invention discloses a high-altitude and low-pressure characteristic simulation test station of an air compressor in an internal-combustion engine, relating to a characteristic simulation test station of an air compressor in an internal-combustion engine, and comprising an air pipeline system and a lubricating system, wherein the air pipeline system comprises a vacuum pump, a pressure stabilizing box, and an air filter, a flow testing section, an air inlet parameter testing section, a flow stabilizing section and an air compressor sequentially connected with an outlet of the pressure stabilizing box, and an air exhaust parameter testing section, a back pressure regulating valve, a stopping valve and an air exhaust intercooler sequentially connected with an outlet of the air compressor;the lubricating system comprises an oil tank, an oil supplying system and a lubricant intercooler; an outlet of the air exhaust intercooler is connected with the pressure stabilizing box so that an air pipeline of the test station forms a sealed air circulation system; and the oil tank is arranged inside the pressure stabilizing box so as to improve the sealing property of the test station. The test station can simulate the environmental pressure at the altitude of 0-30,000 meters and performs the high-altitude simulation characteristic test of the air compressor in the turbo-charged internal-combustion engine, therefore, the sealing property and simulated altitude of the test station are higher than those of the existing simulation test station of the same type.

Description

technical field [0001] The invention relates to a high-altitude performance test bench for an internal combustion engine compressor, in particular to a simulation test bench for the characteristics of an internal combustion engine compressor, which belongs to simulation test equipment in an artificial environment. Background technique [0002] Turbocharged internal combustion engines are the power of choice for high-altitude, low-speed, long-duration drones. In the high-altitude environment of the existing turbocharging system, the change of altitude has a significant impact on the performance of the turbocharging system. For example, at an altitude of 30,000 meters, the atmospheric pressure is only 1 / 85 of the ground, and the air intake conditions of the compressor change greatly, resulting in the decline of the efficiency, pressure ratio and stable flow range of the compressor, thus affecting the turbocharging. The output power and specific fuel consumption of the interna...

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Problems solved by technology

In this scheme, because the temperature control is more complicated, the cost will be greatly increased. On the other hand, considering that the change of the ambient pressure caused by the altitude change is the dominant factor for the performance change of the compressor, this kind of high-altitude simulation test Taiwan often only simulates the high-altitude ambient pressure, but does not simulate the high-altitude ambient temperature

[0005] However, the current high-altitude simulation test bench is still unable to simulate the atmospheric environment above 10,000 meters, which is limited by its design structure and sealing performance.

At present, the design scheme of this kind of high-altitude simulation test bench is generally an open scheme, that is, the intake air of the compressor is extracted from the atmospheric environment, and then exhausted by the compressor and then returned to the atmospheric environment. Therefore, in this scheme, large For vacuum pumps or ejectors with pumping capacity, under the same mass flow rate of the compressor, as the simulated height increases, the air density decreases and the volume of the air gradually increases. Correspondingly, the pumping capacity of the vacuum pump or ejector needs to be increased. , so the working capacity of the air extractor or ejector directly limits the height that can be simulated by the high-altitude simulation test bench; in addition, the poor sealing effect of the test bench of this open scheme also limits the maximum height that can be simulated

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