scholarly journals Research of Gas Jet Pumps with Diagraphic, Conical and Laval Nozzles

2020 ◽  
Vol 129 (4) ◽  
pp. 53-57
Author(s):  
M. A. Suleymanov ◽  
◽  
O. A. Tsoy ◽  
Keyword(s):  
High Pressure ◽  
Test Bench ◽  
Gas Jet ◽  
Energy Characteristics ◽  
Jet Pumps ◽  
Laval Nozzles ◽  
Optimal Configurations ◽  
Working Agent ◽  
Nozzle Type

This article is devoted to the research of the nozzle type (conical, diaphragm and Laval nozzles) influence on the characteristics of the jet pumps, in which high-pressure gas is used as a working agent for ejecting gas and liquid. The scheme of the test bench, the working characteristics of the jet pumps and the results of the experiment are also described in detail. The article provides recommendations on the most optimal configurations for different nozzles and experimentally proved the effectiveness of conical nozzles in both pressure and energy characteristics.

A Numerical Investigation on Mixing Characteristics of Natural Gas Jets With High-Pressure Injection

2021 ◽  
Author(s):  
Long Liu ◽  
Tianyang Dai ◽  
Qian Xiong ◽  
Yuehua Qian ◽  
Bo Liu
Keyword(s):  
High Pressure ◽  
Natural Gas ◽  
Air Entrainment ◽  
Gas Jet ◽  
Swirl Ratio ◽  
Marine Engine ◽  
Low Speed ◽  
Pressure Injection ◽  
Mixing Characteristics ◽  
High Pressure Injection

Abstract With increasingly stringent emissions limitation of greenhouse gas and atmospheric pollutants for ship, the direct injection of natural gas on the cylinder head with high-pressure injection is an effective method to make a high power output and decrease harmful gas emissions in marine natural gas dual fuel engines. However, the effects on mixing characteristics of high-pressure natural gas underexpanded jet have not been fully understood. Especially, the injection pressure is up to 30 MPa with large injection quantity and critical surrounding gas conditions for the low-speed two-stroke marine engine. Therefore, this research is focused on the flow and mixing process of the natural gas jet with high-pressure injection under the in-cylinder conditions of low-speed two-stroke marine engine. The gas jet penetration, the distribution of velocity and density, the equivalence ratio and air entrainment have been analyzed under different nozzle hole diameters by numerical simulation. The effects of surrounding gas conditions including pressure, temperature and swirl ratio on air entrainment and equivalence ratio distribution were studied in detail. From the numerical simulation, it is found that the mixing characteristics of natural gas jet can be improved under in-cylinder conditions of higher ambient temperature and swirl ratio, which is relevant to the low-speed two-stroke marine engine.

scholarly journals Characterization of a cryogenically cooled high-pressure gas jet

2007 ◽  
Vol 56 (12) ◽  
pp. 6918
Author(s):  
物理学报
Keyword(s):  
High Pressure ◽  
Gas Jet

Gas jet flow characteristic of high-pressure methane pulsed injection of single-hole cylindrical nozzle

Fuel ◽  
2019 ◽  
Vol 257 ◽  
pp. 116081 ◽  
Author(s):  
Yan Lei ◽  
Jiaxing Liu ◽  
Tao Qiu ◽  
Yunqiang Li ◽  
Yupeng Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
Flow Characteristic ◽  
Jet Flow ◽  
Gas Jet ◽  
Single Hole ◽  
Cylindrical Nozzle ◽  
Pulsed Injection

Thermo-elastohydrodynamic simulation of the piston-cylinder contact in high-pressure pumps at 3000 bar

2019 ◽  
Vol 71 (5) ◽  
pp. 702-705
Author(s):  
Ömer Özdemir ◽  
Felix Fischer ◽  
Adrian Rienäcker ◽  
Katharina Schmitz
Keyword(s):  
High Pressure ◽  
Thermal Stresses ◽  
Test Bench ◽  
High Pressures ◽  
Elastohydrodynamic Lubrication ◽  
Simulation Method ◽  
Pressure Effects ◽  
High Pressure Pump ◽  
Content Type ◽  
Piston Cylinder

Purpose The purpose of this paper is to show these effects in an abstracted micro gap test bench. Because of stronger emission laws, the ambition to raise the rail pressure in common-rail systems from the current 2500 bar to 3000 bar is a given. The pressure increase will allow fine atomization of fuel and therefore more efficient combustion. But within the technical system of the high-pressure pump, stronger thermal stresses of the piston–cylinder contact are expected. A pressure drop from such a high level causes high temperature gradients due to energy dissipation. Design/methodology/approach For a detailed examination, the critical piston–cylinder contact has been investigated in an abstracted test bench with a flat parallel gap and an equivalent thermo-elastohydrodynamic simulation model. Findings The simulation results show good accordance to the measurements of pressures, temperatures and leakages for pressures up to 3000 bar. Comparison with elastohydrodynamic lubrication results outlines the need to consider temperature and pressure effects viscosity and solid deformation for the simulation and design of tribological contacts at high pressures. Originality/value This paper describes a simulation method with high accuracy to investigate tribological contacts considering temperature effects on solid structures and the fluid film. The thermo-elastohydrodynamic lubrication simulation method is valid not only for piston–cylinder contacts in high-pressure pumps but also for journal bearings in combustion engines.

scholarly journals High Pressure Supersonic Gas Jet Fueling on NSTX

2007 ◽  
Author(s):  
V. A. Soukhanovskii ◽  
M. G. Bell ◽  
W. R. Blanchard ◽  
J. K. Dong ◽  
R. C. Gernhardt ◽  
...  
Keyword(s):  
High Pressure ◽  
Gas Jet ◽  
Supersonic Gas Jet
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