scholarly journals Influence of water injection parameters on the performance of a water-lubricated single-screw air compressor

2022 ◽  
Author(s):  
Yanan Li ◽  
Jingfu Wang ◽  
Yuting Wu ◽  
Biao Lei ◽  
Ruiping Zhi ◽  
...  
Keyword(s):  
Water Injection ◽  
Air Compressor ◽  
Single Screw ◽  
Injection Parameters ◽  
Influence Of Water

scholarly journals Influence of water injection atomization on the performance of water-lubricated single screw air compressor

2021 ◽  
Vol 257 ◽  
pp. 03069
Author(s):  
Yanan Li ◽  
Jingfu Wang ◽  
Yuting Wu ◽  
Biao Lei
Keyword(s):  
High Efficiency ◽  
Droplet Diameter ◽  
Water Injection ◽  
Hydrogen Fuel Cell ◽  
Compression Process ◽  
Air Compressor ◽  
Single Screw ◽  
Discharge Temperature ◽  
New Energy ◽  
Influence Of Water

As the whole society attaches great importance to the safety of food and medicine, and hydrogen fuel cell and new energy vehicle industry rises suddenly, people’s requirements for clean compressed air is more and more urgent. Water-lubricated single screw compressor is an ideal choice for providing clean air because of the advantages of balanced force, a long service life, and high efficiency, and the influencing factors of its performance have received more and more attention. This study established a mathematical model of the working process of a water-lubricated single-screw air compressor to study the relationship between its performance and the water injection atomization. The model considered leakage and heat transfer between water and moist air and analysed the influences of droplet diameter and rotation speed on compressor performance. The results showed that water injection atomization can effectively reduce the discharge temperature, make the compression process of the compressor tend to isothermal compression. Under rated conditions, a reduction in the droplet diameter from 0.25 mm to 0.15 mm reduced the discharge temperature of the compressor, improved the volume efficiency, and improved the adiabatic efficiency by 31 K, 2.6%, and 8.2%, respectively.

Computational Study on Influence of Water Injection Angle to Aluminum/Water Reaction Motor

2012 ◽  
Vol 248 ◽  
pp. 539-544
Author(s):  
Zheng He ◽  
Xuan Gu ◽  
Ye Gao
Keyword(s):  
Computational Study ◽  
Aluminum Particle ◽  
Specific Impulse ◽  
Water Injection ◽  
Water Droplets ◽  
Aluminum Particles ◽  
Injection Angle ◽  
Influence Of Water ◽  
Afterburning Chamber ◽  
Multi Phase

In Aluminum/Water Reaction Motor chamber, water injection angle plays an important role on mixture of aluminum particle fuel and water droplets and can affect motor performance further. On the basis of FLUENT software and taking phase transition and reaction between water droplets and aluminum particles into account, numerically simulated cases of different water injection angles by Particle Stochastic Trajectory Model. Computed total evaporation rate of water droplets, reaction rate of aluminum particles and specific impulse for the motor. Furthermore judged injection angle effect from these parameters. By comparison and analysis, it is found that hybrid injection case could get best multi-phase mixture effect and specific impulse performance for the motor. Namely axial injection angle with 45°in the main chamber and tangential injection angle with 60°in the afterburning chamber is the best case. The conclusion could provide a new idea for motor working process design.

Experimental Investigation of the Influence of Water Injection on Acoustic Properties of the Exhaust System of a Gas Turbine Combustion Test Rig

2011 ◽  
Author(s):  
Martin Schmid ◽  
Natalie Trott ◽  
Robert Kathan ◽  
Dan Fanaca ◽  
Thomas Sattelmayer
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Droplet Diameter ◽  
Water Injection ◽  
Exhaust System ◽  
Acoustic Properties ◽  
Sonic Velocity ◽  
Test Rig ◽  
Stability Behavior ◽  
Influence Of Water

It is a known phenomenon that single can combustion test rigs and gas turbines have a different stability behavior. Real gas turbines are often more stable than their test rigs. One main difference between test rigs and real engines is the injection of cooling water into the test rigs to reduce the temperature of the exhaust gas and thus to protect the exhaust valve. A literature survey showed that the presence of a two phase flow can drastically reduce the sonic velocity and consequently change the acoustic properties of a system. The aim of this project is to study the influence of water injection on the acoustic properties of a test rig representing the exhaust system of a gas turbine. The experimental results clearly show that the sonic velocity does not change in the present test rig because the droplets are too big to follow the acoustic fluctuations. The critical dimension-less number in this context is the Stokes number, which is mainly determined by the droplet diameter and the acoustic frequency. Furthermore, the experimental results point out that the injected water increases the acoustic damping. It can be concluded from this study that the influence of water injection on the acoustic properties and therefore on the stability behavior is very sensitive to the injection conditions, especially the droplet diameter.

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