Study on the efficiency of a new central-type diffuser for hypersonic low density wind tunnel

Bi Lin; Li Zhenqian; Tang Zhigong; Yuan Xianxu; Chen Hao

doi:10.11729/syltlx20190063

Volume 33 Issue 6

Dec. 2019

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Journal of Experiments in Fluid Mechanics > 2019 > 33(6): 28-33. > DOI: 10.11729/syltlx20190063

Bi Lin, Li Zhenqian, Tang Zhigong, Yuan Xianxu, Chen Hao. Study on the efficiency of a new central-type diffuser for hypersonic low density wind tunnel[J]. Journal of Experiments in Fluid Mechanics, 2019, 33(6): 28-33. DOI: 10.11729/syltlx20190063

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Study on the efficiency of a new central-type diffuser for hypersonic low density wind tunnel

Bi Lin^{1, 2, ,},
Li Zhenqian³,
Tang Zhigong^{1, 2},
Yuan Xianxu^{1, 2},
Chen Hao^{1, 2}

1.
State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China
2.
Computational Aerodynamics Institute of China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China
3.
Hypervelocity Aerodynamics Institute of China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China

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Received Date: May 12, 2019
Revised Date: September 02, 2019

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Abstract

The diffuser is one of the key components of the supersonic and hypersonic wind tunnels, which directly affects the efficiency-cost ratio of the wind tunnel operation. However, for the hypersonic low density wind tunnel, the range of operating parameters is large and the test gas density is relatively low, and thus the effects of the conventional diffuser with "contraction section, equi-straight section and expansion section" are not obvious. In this paper, a new central-type diffuser structure is presented, and the efficiency of the central-type diffuser is tested at the Φ300 mm hypersonic low density wind tunnel for M16 small flow rate states and M8 large flow rate states. At the same time, the influence of the test section model on the diffuser's capacity is analyzed. The results show that the central-type diffuser has a wide range of operation parameters and a significant pressure increase efficiency, and can effectively improve the wind tunnel test capability. This study can provide a reference for the design of the hypersonic wind tunnel diffuser.
- low density wind tunnel,
- hypersonic,
- diffuser,
- diffuser efficiency

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