An investigation has been carried out to assess the effect of volute design on the performance of a centrifugal compressor. Three volutes, based on a turbocharger compressor volute, have been fabricated and tested. These volutes provided two that were larger than the original design, and one that was smaller. The alternative volute designs were fabricated from sheet steel and had a square cross...

A pressure pulsation experiment of a dishwasher pump with passive rotation double-tongue volute was carried out and compared the single-tongue static volute. The three models analyzed from two aspects different impeller speeds monitoring points. frequency domain time–frequency were obtained by Fourier transform short-time transform, respectively. results showed that average each point on rotati...

Effect of the volute tongue multi-blade centrifugal fan on performance machines is significance. The shape and installation angle affect circulating internal flow behavior as well energy loss around tongue. In this study, profile leading edge owl wing applied to a improve aerodynamic fan. models with different angles are numerically simulated under conditions. research results show that propose...

Cavitation is regarded as a considerable factor causing performance deterioration of pumps under off-design conditions, especially at overload conditions. To investigate the unsteady cavitation evolution around tongue pump volute, and its influence on flow field within passages impeller, numerical calculations several hydraulic tests were performed typical centrifugal with shrouded impeller. Em...

A numerical optimization is presented to reduce the vibration and noise of a centrifugal fan volute. Minimal vibration was considered as the aim of the optimization, and the calculation of sound field induced by the vibration of the volute was only based on the final results of the optimization. After the three-dimensional unsteady flow simulation of a centrifugal fan, the parametric finite ele...

Multi-wing centrifugal fans are wildly used in the central air-conditioning. The influence of dimensionless clearance volute-tongue on aerodynamic performance and noise is studied by numerical simulation experimental tests this paper. complicated internal flow related to unsteady a fan with multiple wings investigated simulation. Besides, circumstance analyzed. It testified that ameliorated usi...

The flow instability of a double-blade centrifugal pump is more serious due to its special design feature with two blades and large passages. dynamic instabilities pressure pulsations can affect the performance operating lifetime. In present study, numerical investigation unsteady time variation within complete was carried out. domain frequency were extracted at 16 monitoring locations covering...

In this study, the effects of the volute tongue geometry variation on the head, efficiency, velocity distribution and cavitation structure of a centrifugal pump in the steady flow behavior under off-design conditions have been investigated. Numerical simulation modeling based on the  turbulence model with a hybrid grid is used to simulate the flow within the modeled pump. The flow is simulated ...

The structural and aerodynamic performance of the air inlet volute has an important influence on the performance of the gas turbine. On one hand, it requires the airflow flowing through inlet volute as even as possible, in order to reduce the pressure loss, to avoid a decrease in the effective output power and an increase of the fuel consumption rate of the internal combustion engine which indi...