Good Price Diesel Pump Head Rotor 096400-1890 Fuel Injection Pump Elements Engine Spare Parts

Abstract
The pump head, as a core component of high-pressure fuel injection and hydraulic systems, governs fuel delivery accuracy and system stability. Its internal flow behavior directly affects injection pressure, cavitation formation, and overall efficiency. In this study, computational fluid dynamics (CFD) was employed to analyze the internal flow characteristics of the pump head under different operating conditions, and the results were validated through experimental testing.

1. Introduction
During pump operation, fluid passes through complex passages, including the plunger chamber, delivery valve seat, and outlet channels. This process often generates unsteady phenomena such as turbulence, cavitation, and pressure fluctuations. Traditional theoretical methods are insufficient to fully describe these nonlinear effects, making numerical simulation combined with experimental verification a powerful approach for studying pump head flow dynamics.

2. Numerical Simulation Method
A three-dimensional CFD model of the pump head was developed, incorporating the plunger cavity, valve seat geometry, and flow channels. Boundary conditions were set according to typical injection pressures and flow rates. The moving mesh technique was applied to simulate plunger motion, and the RNG k-ε turbulence model was adopted to capture vortical structures. Cavitation effects were considered using a multiphase flow model. The simulation outputs included velocity vectors, pressure distributions, and cavitation regions, allowing for detailed insight into internal flow behavior.

3. Experimental Verification
To validate the numerical model, a high-pressure flow test bench was constructed. Pressure transducers and flow meters were installed to record transient flow characteristics, while a transparent visualization section enabled high-speed imaging of cavitation phenomena. Particle Image Velocimetry (PIV) was employed to measure velocity fields near the valve region. Comparison between simulation and experimental results demonstrated strong consistency in pressure drop trends, flow rate characteristics, and cavitation onset, confirming the reliability of the CFD model.

4. Results and Discussion
The combined results revealed several key findings:

• At small plunger lifts, severe throttling at the valve seat led to high-velocity jets and localized pressure drops, which promoted cavitation.

• Flow separation and vortex formation were observed at sharp structural transitions, contributing to additional pressure loss.

• Increasing valve seat chamfer radius effectively mitigated cavitation intensity and improved flow uniformity.

• The experimental data confirmed that optimized structural parameters could reduce pressure loss by up to 12% while maintaining stable flow delivery.

5. Conclusion
Numerical simulation combined with experimental validation provides a robust framework for analyzing pump head internal flow dynamics. The results indicate that structural optimization, particularly at the valve seat and flow passages, can significantly reduce pressure loss and suppress cavitation. This study not only enhances understanding of pump head flow mechanisms but also provides guidance for future design improvements aimed at higher efficiency and durability.