Français
4. Analysis of impeller blade noise
4.1 Representation of the wheel output speed field
To try and understand how simple flow distortion can generate pressures as great as those required to create the fundamental noise, let's take the case of a centrifugal pump for which the flow velocity field shown in figure 10 has been measured with a laser velocimeter at 5% beyond the outer radius r 2 of the impeller.
The Ultimate Scientific and Technical Reference
This article is included in
Hydraulic, aerodynamic and thermal machines
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Analysis of impeller blade noise
Computational noise prediction
Bibliography
Circuit calculation codes
Pressure fluctuations emitted by a pump (or valve) must be analyzed to determine the risk they represent for the circuit (stresses, vibration levels, natural frequencies, forces exerted on the structure).
As we have already seen
Standardization
All aspects of testing standards are covered in depth in the reference . We have extracted the most important passages:
Airborne noise measurement
The Ultimate Scientific and Technical Reference
