该摘要应详细说明用于研究的原理，在风险评估后面说明对所实施的控制策略的论证。
This summary should detail the rationale used to conduct the study, and include a justification of the control strategy implemented following the risk assessment.
摘要：以三个不同流量系数的模型级为研究对象，对其无叶扩压器进口部分进行了详细分析。
Abstract: in this paper, set the three model stages with different flow coefficient as the research subject, the inlet of vaneless diffuser is analyzed in detail.
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