JB/T 2293-1978 Test method for radiator air ducts of automobiles and tractors
This standard is applicable to performance tests of cooling system radiators of automobiles, tractors, construction machinery, internal combustion engines for small crafts, stationary and mobile internal combustion engines, and model cores.
1 Test items
1.1 The following three performance tests are conducted for radiators:
a) the heat dissipation performance test;
b) the air resistance test;
c) the water flow resistance test.
2 Test conditions
2.1 The finished radiators and model cores must meet the requirements of the product drawings approved according to the prescribed procedures.
2.2 The water used for tests must be clean and free of sediment, rust, and other impurities.
2.3 In this standard, the tests are carried out at normal temperature using the air suction test method. During these tests, the fluctuation of the air inlet temperature shall not exceed ±5°C. No obstacles are allowed within a distance of 3D from the air inlet of the air duct. The distance between the edge of the air inlet and the ground shall be greater than D.
Note: When the air duct is circular, D is the inner diameter of the air duct; when the air duct is rectangular, D is half of the sum of the height and the width.
2.4 Test equipment and instruments must be inspected and calibrated before testing.
3 Test equipment
3.1 The test equipment consists of the air duct circulation water circuit, circulation water heating device, water pump, fan, test instruments, control devices, etc. See Figure 1 for the layout of the test equipment.
Figure 1 Schematic diagram of the test equipment layout
3.2 The lemniscate curve is adopted for the shape of the air inlet collector of the air duct, as shown in Figure 2.
Figure 2 Curve graph of the air inlet
The inner diameter D of the small air duct is 250 mm and that of the large air duct is where A and B are the height and the width of the cross section of the air duct, respectively. The inner wall of the air duct must be flat and smooth and all connections must be sealed without air leakage. To make the airflow uniform and stable, the flow control screen and grid are respectively arranged in the front and rear air ducts of the radiator. See Figure 3 and Figure 4 respectively for the air duct structures of the finished radiator and the model core.
1 Test items
2 Test conditions
3 Test equipment
4 Test instruments
5 Test methods
6 Results summary
Annex
