A composite measuring device for airflow velocity and temperature for low-speed flow field

Abstract

The invention relates to an air flow velocity and temperature composite measuring device for a low velocity flow field. The device comprises a wind deflector, a connecting support arm fixedly arranged on the wind deflector, and a total pressure pipe and a static pressure pipe which are arranged on the wind deflector and respectively connected with the inside of the wind deflector. Two ends of the wind deflector are provided with a wind deflector air inlet and a wind deflector air outlet respectively. A thermocouple is arranged at the wind deflector air outlet. Compared with the prior art, the device of the invention ensures that the direction of the total pressure pipe is consistent with the direction of an incoming flow and reduces the sensitivity to the incoming flow by the arrangement of the wind deflector hood; and the device has a compact size, can measure the air flow velocity and temperature of a low velocity field simultaneously in a region with a small space and complicated flow, is high in environmental adaptability, accurate in measurement, high in stability and small in disturbance to the flow field, avoids the interference to the measured region during the measurement, can be installed separately and also be assembled through a threaded rod into a measurement array, and is simple in layout and high in flexibility.

Description

technical field [0001] The invention belongs to the technical field of airflow measurement, and relates to an airflow velocity and temperature composite measurement device for low-speed flow field. Background technique [0002] In recent years, my country's auto industry has developed rapidly. The production and sales volume of automobiles has already surpassed that of the United States and Japan, ranking first in the world for eight consecutive years. With the continuous development of the automobile industry, the country has higher and higher requirements for automobiles in terms of fuel economy and emission levels. At the same time, consumers are paying more and more attention to automobile performance and comfort. Enterprises have invested a lot of manpower and material resources in research on engine thermal management, air-conditioning performance, body aerodynamics, and aerodynamic noise. In the course of these studies, it is indispensable to obtain velocity and temp...

AI Technical Summary

Problems solved by technology

Among them, when the pitot tube and the impeller measure the airflow velocity, they are sensitive to the direction of the airflow. It is necessary to make the arrangement direction of the pitot tube or the impeller completely consistent with the direction of the incoming flow to ensure the accuracy of the measurement, and it is affected by the size of the pitot tube and the diameter of the impeller. However, when the thermocouple measures the airflow temperature, the thermocouple must be firmly fixed on the measurement point. If the thermocouple is directly fixed to a certain part in the car, it will not only fix the It is more difficult, and it will also affect the normal work of various systems in the car

When it is necessary to simultaneously measure the speed and temperature of the airflow in a small space (such as before and after the radiator of a car), the existing measurement methods have obvious limitations: one is that the airflow is affected by the air intake grille, condenser and cooling fan , it will become uneven, making the airflow direction of the measuring point uncertain and affecting the accuracy of the measurement; second, the distance between the condenser and the radiator is usually less than 20mm, which is not conducive to the layout of the measuring instrument; third, some parts ( Such as radiators, three-way catalytic converters, etc.) The temperature is high, which makes the working environment of the measuring instrument too harsh and affects the normal progress of the measurement process.

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