Numerical investigation on the difference of dispersion behavior between cryogenic liquid hydrogen and methane

2019 ◽  
Vol 44 (39) ◽  
pp. 22368-22379 ◽  
Author(s):  
Liang Pu ◽  
Xin Tang ◽  
Xiangyu Shao ◽  
Gang Lei ◽  
Yanzhong Li
Keyword(s):  
Numerical Investigation ◽  
Liquid Hydrogen ◽  
Cryogenic Liquid ◽  
Dispersion Behavior ◽  
The Difference

Numerical Investigation of a Cryogenic Liquid Turbine Performance and Flow Behavior

2008 ◽  
Author(s):  
Wei Zhao ◽  
Jinju Sun ◽  
Hezhao Zhu ◽  
Cheng Li ◽  
Guocheng Cai ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Large Scale ◽  
Flow Behavior ◽  
Cryogenic Liquid ◽  
Air Separation ◽  
Design Flow ◽  
Suction Surface ◽  
Navier Stokes Equation ◽  
Separation Unit ◽  
Turbine Performance

A single stage cryogenic liquid turbine is designed for a large-scale internal compression air-separation unit to replace the Joule-Thompson valve and recover energy from the liquefied air during throttling process. It includes a radial vaned nozzle, and 3-dimensional impeller. Numerical investigation using 3-D incompressible Navier-Stokes Equation together with Spalart-Allmaras turbulence model and mixing plane approach at the impeller and stator interface are carried out at design and off-design flow. At design condition, recovered shaft power has amounted to 185.87 kW, and pressure in each component decreases smoothly and reaches to the expected scale at outlet. At small flow rates, flow separation is observed near the middle section of blade suction surface, which may cause local vaporization and even cavitation. To further improve the turbine flow behavior and performance, geometry parametric study is carried out. Influence of radial gap between impeller and nozzle blade rows, and nozzle stagger angle on turbine performance are investigated and clarified. Results arising from the present study provide some guidance for cryogenic liquid turbine optimal design.

scholarly journals Numerical Simulation of Erosion Characteristics for Solid-Air Particles in Liquid Hydrogen Elbow Pipe

2021 ◽  
Vol 13 (23) ◽  
pp. 13303
Author(s):  
Wenqing Liang ◽  
Qining Xun ◽  
Zhiyong Shu ◽  
Fuming Lu ◽  
Hua Qian
Keyword(s):  
Theoretical Basis ◽  
Erosion Rate ◽  
Outer Wall ◽  
Liquid Hydrogen ◽  
Cryogenic Liquid ◽  
Crystalline Solid ◽  
Radius Of Curvature ◽  
Hydrogen Flow Rate ◽  
Hydrogen Flow ◽  
Function Relationship

The crystalline solid-air in the liquid hydrogen will cause erosion or friction on the elbow, which is directly related to the safety of liquid hydrogen transportation. The CFD-DPM model was used to study the erosion characteristics of solid-air to liquid hydrogen pipelines. Results show that the outer wall of the cryogenic liquid hydrogen elbow has serious erosion in the range of 60–90°, which is different from the general elbow. The erosion rate is linearly positively correlated with the mass flow of solid-air particles, and the erosion rate has a power function relationship with the liquid hydrogen flow rate. The fitted relationship curve can be used to predict the characteristics and range of the elbow erosion. The structure of the liquid hydrogen elbow also has an important influence on the solid-cavity erosion characteristics. The increase of the radius of curvature is conducive to the reduction of the maximum erosion rate, while the average erosion rate undergoes a process of increasing and then decreasing. The radius of curvature is 60 mm, which is the inflection point of the average erosion rate of the 90° elbow. The research results are expected to provide a theoretical basis for the prevention of liquid hydrogen pipeline erosion.

Numerical Predictions of Cavitating Flow Within a Liquid Hydrogen Inducer

2021 ◽  
Author(s):  
Robert F. Blumenthal ◽  
Franklyn J. Kelecy
Keyword(s):  
Thermal Conditions ◽  
Liquid Hydrogen ◽  
Cryogenic Liquid ◽  
Specific Model ◽  
General Purpose ◽  
Cavitating Flow ◽  
Operating Conditions ◽  
Model Parameters ◽  
Fluid Temperature ◽  
Numerical Predictions

Abstract With the recent interest in using liquid hydrogen as a fuel source for energy production and transportation, predicting the performance of pumping systems which handle hydrogen has become an important issue. Liquid hydrogen is a cryogenic fluid which exists at extremely low temperatures and presents a myriad of design challenges to ensure a safe, efficient, and robust fuel delivery system. In addition, the typical operating conditions for pumps handling liquid hydrogen are such that vapor formation due to cavitation is present in the flow even when the head rise is relatively unaffected. Cavitation can cause severe damage to pump components and lead to shortened life and eventual failure, especially at the temperatures associated with liquid hydrogen. The present work was focused on validating CFD methods for accurately predicting cavitating flow in a pump inducer handling cryogenic hydrogen. The CFD code used in this study was Ansys CFX, which is a general-purpose commercial solver with models available for simulating cryogenic cavitation in turbomachinery. The specific model employed for cavitation utilized a Rayleigh-Plesset based multiphase formulation in conjunction with thermodynamic property tables appropriate for cryogenic liquid hydrogen. Adjustments to cavitation model parameters were introduced as a function of fluid temperature to account for the thermal suppression head effects that are present at cryogenic thermal conditions.

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