Experimental Analysis of Water Jet Pump Performance and Throat Diffuser Loss Coefficient: An Empirical Correlation
1Research Centre for Energy Conversion Technology, National Research and Innovation Agency, Indonesia
*Author to whom correspondence should be addressed:
E-mail: muha132@brin.go.id (MPH)
E-mail: muha132@brin.go.id (MPH)
Received: May 26, 2025 | Revised: August 06, 2025 | Accepted: December 17, 2025 | Published: December 2025
Abstract
Water jet pumps are widely used in industry, with performance influenced by geometric parameters such as angle, length, and diameter. This study investigates the effects of projection and throat aspect ratios on pump efficiency and diffuser loss coefficient. Nine experimental cases were conducted, and two predictive correlations were developed using nonlinear regression. The correlations were validated against experimental results within the dimensionless range of projection ratio (1-3) and throat aspect ratio (5-9), with marginal errors of 5% for performance and 10% for the loss coefficient. The results have a good agreement with the experiment, offering performance enhancement in design framework.
Keywords
projection ratio; throat aspect ratio; throat diffuser loss coefficient; water jet pump performance
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