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Effect of Oncoming Air Velocity on Automobile Radiator Efficiency

The car radiator, also known as the water tank, is essential for the normal operation of the car engine. In the design process of radiator related products, the heat dissipation under various working conditions is an important consideration. The development and finalization of any new radiator product must be carried out on the radiator performance standard test bench to conduct the actual test of thermal performance. In the working process of the automobile radiator, the oncoming air velocity is an important parameter of the radiator operation. This paper sets different air velocity systems to discuss the influence of the oncoming air velocity on the heat dissipation efficiency of the radiator through the enthalpy difference test of a certain radiator.


1. The heat dissipation efficiency of the automobile radiator is an important indicator to measure the working efficiency of the radiator


Automobile radiator is an important performance index in the product design and development stage. The ability of heat transfer efficiency under the same conditions as the size of the heat dissipation efficiency plays an important role in reducing the energy loss of the automobile, improving the output power of the automobile engine and optimizing the thermal balance system. The heat dissipation efficiency represents the ratio of the actual heat exchange of the radiator to the maximum possible theoretical heat exchange.


The greater the heat dissipation efficiency, the better the heat dissipation effect, which means that the radiator has a greater heat dissipation efficiency and a better heat dissipation effect on the engine. Under the same conditions, more heat can be transferred per unit time. In various operating conditions of automobile radiators, the oncoming air speed is an important parameter index. In order to better study the heat dissipation efficiency under different wind speeds, we keep other parameters of the radiator unchanged, only change the oncoming wind speed, and carry out the radiator. The enthalpy difference test is carried out in order to obtain the influence law of the oncoming wind speed and the heat dissipation efficiency of the radiator.


2. Three major effects of oncoming air velocity on automobile radiators


(1) The oncoming air velocity has a great influence on the heat dissipation efficiency of the radiator, and the heat dissipation efficiency of the radiator decreases significantly with the increase of the oncoming wind speed.


(2) The increase in the head-on air flow can significantly increase the heat dissipation of the radiator, but at the same time, the heat dissipation efficiency will decrease. The oncoming wind speed of the car radiator is the sum of the vehicle speed and the fan speed. Driving at high speed and increasing the fan power of the radiator can increase the heat dissipation, but cannot achieve the purpose of improving the heat dissipation efficiency.


(3) From the numerical observation, with the increase of the oncoming wind speed, the heat dissipation efficiency decreases, but each car radiator has a fixed value. After this fixed value, even if the oncoming wind speed is increased, the heat dissipation will still be significant. increase, but the reduction in heat dissipation efficiency is not significant.

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