A Method for Measuring Shock-Enhanced Supersonic Air Film Fluid Mixing Based on Pressure Sensitive Paint

Abstract

The invention relates to a method for measuring the shock enhanced supersonic gas film fluid mixing based on pressure sensitive paint, and the method comprises the following steps: A), employing air as cooling gas and main gas under the conditions that there are shock waves and there are not shock waves, measuring the distribution of oxygen partial pressure of a wall surface through employing the technology of pressure sensitive paint, and obtaining the quantity of oxygen partial pressure increase caused by pressure increase of a region because of the action of shock waves; B), employing nitrogen as the cooling gas and air as the main gas under the conditions that there are shock waves and there are not shock waves, measuring the distribution of oxygen partial pressure of the wall surface through employing the technology of pressure sensitive paint, and obtaining the quantity of oxygen partial pressure increase of the region; C), removing the quantity of oxygen partial pressure increase obtained at step A) from the quantity of oxygen partial pressure increase obtained at step B), and obtaining the quantity of oxygen partial pressure increase caused by the increase, caused by the mixing of main gas and the cooling gas, of oxygen concentration of the wall surface under the action of shock waves. The method can quantitatively analyze the effect of shock waves on mixing enhancement degree of the main flow and cooling flow.

Description

technical field [0001] The invention relates to a method for measuring the mutual mixing enhancement effect of supersonic gas film cooling main flow and cooling flow under the action of shock waves, in particular to a method for measuring shock wave enhancement based on pressure-sensitive paint in the presence of shock wave incidence in high-temperature supersonic airflow A method for supersonic gas film fluid mixing. Background technique [0002] The basic principle of film cooling is to inject cooling gas along the tangential direction of the wall or at a certain incident angle to form a layer of buffer cooling gas film close to the protected wall, which is used to isolate the wall from the high-temperature gas environment, thereby cooling the wall. Effective thermal protection and chemical protection. At present, it has become a cooling measure for high-temperature components in many occasions, such as high-temperature turbine blades, combustion chambers, etc. Since fil...

AI Technical Summary

Problems solved by technology

However, if sampling measurement and other methods are used, for the supersonic flow field, even the introduction of a tiny measuring tube will inevitably cause changes in the flow field, especially new shock waves, which will affect the original flow. Second, the sampling measurement can only measure the data of a few local points, and the whole field cannot be measured

Images