采用丙酮平面激光诱导荧光方法研究超音速气体引射器中的混合过程

2018/02/23   下载量： 5 次

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应用领域 航空航天
检测样本 航空
检测项目
参考标准 暂无

采用LaVison公司的智能成像测量系统中的平面激光诱导荧光测量方法，用丙酮做示踪剂，研究了超音速气体引射器中的混合过程。

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Supersonic mixing studies are important in the design and development of efficient supersonic
ejectors. As a gas-dynamic device, supersonic ejector pumps up the secondary flow using the
higher kinetic energy of the primary flow itself. Conventional techniques have limited access to
acquire data in such kind of flows to calculate the mixing efficiency. Reacting flows poses further
challenge in instrumentation. Experiments in cold flows manage to reveal important aspects on
supersonic mixing. Advanced optical flow diagnosis helps in probing the flow without large intrusion.
One of such non-intrusive flow diagnostics is Acetone PLIF. A low area ratio supersonic
ejector, operating at a MPD of 2.0 for the range of POP from 4.89 bar to 8.89 bar is taken into
consideration for this experiment. Secondary air intake duct is kept open during this operation and
the ejector is operated in the mixed flow regime. Concentration distribution is qualitatively evaluated
in this experimentation and few basic flow features are captured. Diffusion of secondary flow
into the primary flow and thickening mixing layers are clearly captured. NML computed from
PLMS experiments are also cross verified with current experiments as the mixing process is found
to be happening well above the NML as expected.

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北京欧兰科技发展有限公司
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