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Car Intercooler

Boundary Conditions on Heavy Truck Radiators

The water-cooled engine radiator is a key component of the engine and works by cooling the engine through forced water circulation. Its composition includes three parts: water inlet chamber, radiator core, and water outlet chamber. In the heavy truck radiators, the radiator fluid flows, and the air flows outside the core, and the heat exchange is carried out inside the radiator core.


1. Structures of heavy truck radiators


The cooling water is injected from the top of the upper water chamber of the heavy truck radiator, and the entire cooling system is covered by the radiator cover. The water inlet pipe and the water outlet pipe are respectively located in the upper water chamber and the lower water chamber, the water outlet pipe of the cylinder head is connected with the water inlet pipe, and the water inlet pipe of the pump is connected with the water outlet pipe. Through the connection of the rubber tube, even if there is a slight misalignment between the engine and the radiator, there will be no water leakage. The shock-absorbing pad installed under the radiator can effectively prevent the radiator from being damaged due to vibration. Usually there is a waterproof switch on the outlet pipe of the lower water chamber of the radiator, its function is to discharge the coolant in the radiator in time.


After the hot water flows through the engine water jacket, it is divided into many small strands from top to bottom or horizontally, so that its heat can be dissipated to the surrounding air. The cooling water can have a temperature difference after passing through the heavy truck radiator. The fan behind the radiator can increase the heat dissipation area of the radiator, take away the heat output by the radiator as soon as possible, accelerate the cooling of the coolant, and dissipate the heat from the radiator more quickly. The structure of the radiator is mainly divided into two categories: DC type and cross-flow type.


2. The drag coefficient of the heavy-duty truck radiator condenser


Oncoming wind speed v /ms -1

Pressure loss ∆p /Pa

2.087

41.5

4.893

124.6

7.97

275.3

11.051

488.3


The table above is the experimental data of the pressure loss corresponding to the radiator under different oncoming wind speeds.


Similarly, after fitting the experimental data by the least square method, the functional relationship between the wind speed and the pressure loss after passing through the heavy truck radiator is obtained. In the same way, the resistance coefficient of the condenser can be obtained. For the resistance coefficient of each component in the cooling system, see the resistance coefficient of the cooling component in the cooling system and the inertia resistance coefficient of the cooling component.

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