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Design of New Automobile Radiator Based on Stress Analysis

At present, cars have become one of the indispensable means of transportation in our daily life. Therefore, more attention needs to be paid to it. Especially with regard to the car radiator, it has a crucial impact on the car engine. Car radiators are prone to cracks during use, and even bursting in serious cases. According to this phenomenon, the automobile radiator is improved and perfected so that it can be better matched with the automobile, so that it can be used for a longer time.


1. Specific analysis of automobile radiator stress


When a car is driving, it will gradually generate a lot of heat energy. Therefore, it needs to be dissipated through the car radiator to ensure the stable operation of the engine. The car radiator has a flat tube, and the coolant contained in it will automatically continue to circulate with the operation of the radiator. The unique external fan conducts convection heat transfer to the heat energy generated by the car and takes it away, thereby effectively cooling the engine, to ensure that it can maintain a stable state when the car is running.


The classic car radiators on the market are basically composed of the following main components: the inlet and outlet of the antifreeze, the upper and lower water chambers, the main flat tubes and the cooling belt, etc. A flat tube is placed in the middle of the upper and lower chambers, and a heat dissipation belt is interspersed in the middle of the flat tube, and each part is connected and influenced by each other. When the car is running, the engine generates a large amount of heat energy, which causes the antifreeze to be exposed to high temperature, and thus begins to transfer from the inlet to the upper water chamber. When passing through the flat tubes, the heat dissipation belt interspersed with the flat tubes begins to play a role to prevent the rising temperature from freezing. liquid for cooling. Therefore, the antifreeze that flows into the lower water chamber and then returns to the engine system has resumed the cooling function, which can help the engine cool down very well and enable it to work stably. However, the data shows that the flat tubes of automobile radiators are prone to cracks or bursts, especially in high temperature weather. shorten.


According to this phenomenon, the cracks and bursts of the radiator flat tubes are analyzed, and the microscope is used to observe them. It is found that the plane and curved positions have different situations and different states. It is guessed that the cracks or bursts are due to excessive local stress concentration. caused.


Then through the analysis and research on the basic composition and structural distribution of the automobile radiator, it is concluded that the stress concentration has the following two reasons: First, when the antifreeze fluid flows into the upper water chamber, or during the process of flowing out from the lower water chamber, the antifreeze The cross-sections encountered are quite different, resulting in stress concentration; second, because the cooling flat tubes have flat surfaces and curved surfaces, the antifreeze will not evenly disperse the liquid when it enters the pipeline, so the resulting flow rates are also different. Finally, the antifreeze at the water inlet has a large flow rate and a fast flow rate, and there is a phenomenon of stress concentration.


Through the simulation experiment and specific analysis of the automobile radiator factory, it can be concluded that the stress on the water inlet and outlet of the radiator is relatively strong, which can reach three times that of other positions. Therefore, the flat tubes near these two positions are subjected to stronger concentrated stress, which is prone to cracks and bursts. In response to this phenomenon, the following methods can be selected to alleviate the phenomenon of stress concentration: changing the shape of the flat tube in the radiator, adding multiple protections to the location of the stress concentration, guiding and setting the position and direction of the stress concentration factor, and appropriate methods of cutting and filling.


2. Stress design of new automobile radiator


In order to effectively reduce the stress of the flat tubes in the radiator, it is necessary to control the antifreeze to obtain a uniform fluid flow rate. According to this phenomenon, a new part - fairing is added to the upper and lower water chambers of the traditional radiator. As a result, the coolant can ensure a uniform flow rate when passing through, better complete the heat dissipation function, and promote the stable operation of the car.


The car radiator factory added the car radiator to the fairing. The upper part of the fairing is set with matching fairing holes according to the distance from the water inlet. According to the overall width, six rows of small holes are neatly distributed, and they are proportional or arithmetic progressions. arrangement phenomenon. The lower part of the fairing is set according to the distance from the water outlet to the fairing hole, and the specific setting is set according to the regulations of the upper part.

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