Horizontal pumping system and pumping control method for automobile wind tunnel

Abstract

The invention relates to a system for pumping horizontally on wind tunnel of vehicles and a method for controlling pumping. The system comprises: wind tunnel spout, pumping spout seal, horizontal pumping slot, air flow pumping pipe, flow counter, differential pressure sensor, PLC controller and variable-frequency controller; under the wind tunnel spout being placed the pumping spout, on the front edge being connected with pumping spout seal, on the upper, lower ends of the front edge being connected with the differential pressure sensor; on one end of the flowing counter being connected with the pumping spout, the other end being connected with pumping machine which is connected with the variable-frequency controller; the variable-frequency controller, differential pressure sensor, and the flow counter are respectively connected with the PLC controller. The method comprises: making air flow for testing enter downstream diffusion stage of testing via the inventive device, in front of the testing vehicle forming wind speed profile, selecting different pumping spout seal, adjusting the opening of the pumping spout; calibrating the pressure differential vs. testing wind speed, flow vs. testing wind speed and rotary speed vs. testing wind speed three action control curve, comparing the real pumping flow with the real pressure differential of the upper, lower edges of pumping spout and the calibration curve data.

Description

technical field [0001] The invention belongs to the technical field of aerodynamics and vehicle engineering, and in particular relates to a horizontal suction system and a suction control method of an automobile wind tunnel. Background technique [0002] When the car is running on the road, there is relative motion between the air and the car, and the air velocity U 0 Equal to the driving speed of the car, the airflow velocity in front of the head of the car is equal to a constant in the height direction, which is the so-called "uniform wind speed profile". However, in the wind tunnel, due to the existence of the solid wall boundary layer, the wind speed profile in front of the tested vehicle is not uniform. The existence of the boundary layer in the wind tunnel distorts the simulation of the airflow, especially the airflow characteristics at the bottom of the car are quite different from the actual one. And then affect the accuracy of aerodynamic measurement. In order to ...

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Problems solved by technology

[0003] (1) Disadvantages of basic suction: the vertical suction airflow produces a significant static pressure gradient throughout the test section, which affects the aerodynamic measurement;

[0004] (2) Disadvantages of tangential jets: tangential jets are prone to airflow deflection angles

[0005] This shows that the two traditional boundary layer control systems will reduce the quality of the flow field in the test section

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