Method for measuring gas flow in complicated structure channel based on concentration method

Abstract

The invention discloses a method for measuring gas flow in a complicated structure channel based on a concentration method, which sprays a control gas into an inlet end and an outlet end of a channel by a spraying device. The concentration of the control gas at each inlet end and outlet end of the complicated structure channel is measured, and the main flow gas pressure and the temperature at each outlet end and the control gas flow at each spaying point of the complicated structure channel are measured. The spaying of the control gas into the channel causes a certain difference of the control gas concentration at the inlet end and the outlet end of the channel, the gas flow in the complicated structure channel can be obtained according to the difference of the control gas concentration at the inlet end and the outlet end and the the flow of the sprayed control gas flow. The method of the invention has the advantages as follows: the measured parameters are mainly taken from the inlet and the outlet, the complexity of the structure has no impact on the measuring operability and almost has no effect on the main flow gas, the flow loss and the pressure loss caused by the measurement parameters are avoided, and the method has a strong advantage under the condition of complicated structure channels.

Description

technical field [0001] The invention relates to the field of gas flow measurement. Specifically, it is aimed at the design of complex structure channels, and proposes a method for measuring gas (mainstream gas) flow in complex structure channels based on the concentration method. By analyzing the inlet end of the complex structure channel And the volume concentration difference of a certain selected control gas at the outlet end, to realize the measurement of the mainstream gas flow in the complex structure channel, especially suitable for the air flow measurement and flow distribution measurement under the complex structure channel in the aero-engine air system. Background technique [0002] In the field of aero-engine development, with the improvement of aero-engine performance requirements, the fundamental way is to increase the total temperature before the turbine. However, the material's ability to withstand high temperatures is limited, and it can only work normally at...

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Problems solved by technology

However, there are also many disadvantages. In the air system of an aeroengine, the temperature range is very large, and there are many impurities in the air, which greatly affects the calorimetric gas mass flow measurement.

None of the existing technologies can measure the gas flow in complex channels well. For the measurement of gas flow in complex channels, it is urgent to invent a measurement method with good measurement feasibility, easy guarantee of accuracy, and wide range range.

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