Effect of baffles on internal flow characteristics of double-inhalation centrifugal pumps under low flow conditions DOI

Jiaqiong Wang,

Duan Jun-dong,

Dawei Yang

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(10)

Published: Oct. 1, 2024

In order to investigate the impact of baffles in inhalation chamber on external characteristics and operational stability a double centrifugal pump under low flow conditions, field simulation software ANSYS CFX shear stress transport formulation were employed numerically simulate internal with without baffles. Two models subjected performance curve prediction, field, pressure pulsation, impeller force two being compared analyzed three small conditions 0.6Qd (rated flow), 0.5Qd, 0.4Qd. The velocity vortex distribution inside semi-spiral chamber, as well their state front impeller, analyzed. Research has demonstrated that addition can enhance head efficiency 0.5Qd–0.8Qd. However, there is tendency for obstruction below 0.5Qd. Baffles reduce amplitude pulsation within radial exerted by whole. Consequently, incorporation during 0.5Qd–0.8Qd efficacy pump. Nevertheless, range <0.5Qd, pump's will decline. This study serves foundation design pumps chambers.

Language: Английский

Optimization of hub geometry of a double suction pump as a turbine DOI

Sun Sheng Yang,

Shuai Yi Liu,

Punit Singh

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(12)

Published: Dec. 1, 2024

The double suction pump as a turbine plays an increasingly important role in energy recovery and hydropower generation due to its stable operation simple structure. Therefore, optimization research on it is of great significance. In this article, the unique design hub structure pumps consisting conventional half hubs proposed be modified extend until outer diameter analyzed. Numerical calculations based shear stress transport (SST) k-ω model verified by experiments show that full impeller exhibited superior hydraulic performance, with efficiency about 1%–2% higher than under all operating conditions. Entropy production theory employed analyze losses, we found impellers, compared models, significantly reduce loss, maximum reduction 5.45%. addition, reduces turbulence losses up 5.32% one hand increases friction 4.52% other hand, but account for larger proportion total so overall improved.

Language: Английский

Citations

0
Effect of baffles on internal flow characteristics of double-inhalation centrifugal pumps under low flow conditions DOI

Jiaqiong Wang,

Duan Jun-dong,

Dawei Yang

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(10)

Published: Oct. 1, 2024

In order to investigate the impact of baffles in inhalation chamber on external characteristics and operational stability a double centrifugal pump under low flow conditions, field simulation software ANSYS CFX shear stress transport formulation were employed numerically simulate internal with without baffles. Two models subjected performance curve prediction, field, pressure pulsation, impeller force two being compared analyzed three small conditions 0.6Qd (rated flow), 0.5Qd, 0.4Qd. The velocity vortex distribution inside semi-spiral chamber, as well their state front impeller, analyzed. Research has demonstrated that addition can enhance head efficiency 0.5Qd–0.8Qd. However, there is tendency for obstruction below 0.5Qd. Baffles reduce amplitude pulsation within radial exerted by whole. Consequently, incorporation during 0.5Qd–0.8Qd efficacy pump. Nevertheless, range <0.5Qd, pump's will decline. This study serves foundation design pumps chambers.

Language: Английский

Citations

0