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  Experimental Facilities
Xi'an Aerospace Propulsion Institute set up a Fluid Testing Technique Research Centre and a Hot Working Medium Testing Technique Research Centre, with the capability of conducting tests on cold flow, hot working medium and mechanical environment, and also developing and integration of large-scale testing system. Tests on pumps, valves and automatic nozzles for fluid characteristics, temperature and humidity environment, strength, vibration, shock and other mechanical environments can be performed.
Based on decades of experience in experimental investigation, Xi'an Aerospace Propulsion Institute has established complete evaluation methods and criteria for experimental system stability, which has been efficiently applied in state control of testing system, thus high-precision and highly reliable test data can be offered.
Cold Flow Test Facility
The Fluid Testing Technique Research Centre internally developed a high-precision, closed-cycle pump hydraulic test system with world-leading testing capacity and automation level, which is also the largest in Asia. The system can provide the greatest diversity of functions of its kind in China. The center can offer cold flow test systems with several test stands, fluids of large flow rate, high pressure and small flow rate, micro pressure are all acceptable. Capabilities as experimental investigations for flow characteristics of special valves and pumps, atomization uniformity of combustion devices, fluid mixture ratio, synthetical cold-flow test of fluid supply system are available. Experimental researches on POGO dynamic characteristics of high-power pump, phase step and frequency response characteristics of high-pressure flow regulator were conducted firstly in China.
Hot Working Fluid and Medium Test Facility
A variety of specialized test stands are available for: large-flow combustion device test, high-frequency combustion instability simulation, liquid oxygen (nitrogen) components test, operation test of bearings and end-face seals with aqueous medium, igniter test, new combustion devices test, and test of aerodynamic characteristics of turbines with cold or hot working medium.
Large pneumatic and hydraulic test systems can be developed independently, and rich experiences in toxic and highly corrosive medium test system, low-temperature test system, and combustion test system have been accumulated. In the measuring area, multichannel, high-precision, high acquisition frequency test system can be developed independently, and particularly experienced in measuring parameters as high/low temperature, high pressure and large flow rate. Control system development is also within our reach. Multichannel, multivariate, and high-precision control system can be developed, particularly well at sequence control.
Mechanic environment testing capacity
The acceleration testing machine is used for centrifugal tests. The key parameters are listed as follows: the maximum loading: 100 kg, the height of center of gravity: 250 mm, the swing radius: 2250 mm, the acceleration range 30~100g and the maximum working duration: 60 min.
The centre has X-ray residual stress tester which could be applied in both laboratory and outside. By using X-ray diffraction method, the tester can measure the residual stress of material the after strength experiment without destroying test specimen. The tester is suitable for the materials including iron, stainless steel, ferronickel and titanium alloy. Equipped with the corresponding peeling device, the tester can be used to measure the stress distribution along the depth direction. The tester is very portable for using not only in the laboratory to test and analyze specimens, small mechanical parts and components but also in factories, workshops and facility locations. The system satisfies the technical standards of both ASTME915 and ASM Handbook V11. The error of 10 times measurements for non-stress iron powder is below ±8MPa. Meanwhile the shear loading can be obtained. For carbon steel, the testing time is no more than 4 minutes for one point.
Structure modal test capacity
Modal analysis is used to obtain the natural vibration characteristics of structure (i.e., nature frequencies, damping ratio, mode shapes, etc.) by testing the dynamic parameters, which is the basis for vibration characteristic analysis of structure, fault diagnosis and forecasts, vibration and noise reduction and dynamics optimization. The centre has kinds of modal analysis systems, such as LMS Test lab and B&K Pulse system having measurement channels up to 150. Exciting methods include hammers, electromagnetic exciters, and hydraulic exciters. The centre also has high-precision acceleration sensors. Moreover, non-contacting 3D laser vibration measurement system, which ensures the test objects are not affected by structure mass and frequency range. can complete modal tests for large and complex structures as well as non-linear system.
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