Effect of primary water injection angle on thermal propulsion performance of a water ramjet engine

2020 ◽  
Vol 97 ◽  
pp. 105630
Author(s):  
Dechao Liu ◽  
Shulei Li ◽  
Gongnan Xie
Keyword(s):  
Water Injection ◽  
Injection Angle ◽  
Ramjet Engine ◽  
Propulsion Performance ◽  
Primary Water ◽  
Water Ramjet

Numerical Analysis of Gas Turbine Inlet Fogging Nozzle Manifold Pressure Drop

2014 ◽  
Author(s):  
Hai Zhang ◽  
Qun Zheng ◽  
Mustapha Chaker ◽  
Cyrus Meher-Homji
Keyword(s):  
Pressure Drop ◽  
Gas Turbine ◽  
Flow Resistance ◽  
Research Effort ◽  
Water Injection ◽  
Injection Velocity ◽  
Injection Angle ◽  
Turbine Inlet ◽  
Area Of Concern ◽  
Inlet Duct

The air pressure drop over the nozzles manifolds of inlet fogging system and the flow resistance downstream of the nozzle array (manifold) have always been an area of concern and is the object of this paper. Fogging nozzles arrays (involving several hundred nozzles) are mounted on channels and beams, downstream of the inlet filters and affect the pressure drop. The water injection angle, nozzle injection velocities and the progressive evaporation of the water droplets evaporation all influence the inlet pressure seen at the gas turbine inlet. This paper focuses on a numerical simulation investigation of flow resistance (pressure drop) of inlet fogging systems. In this research effort, the inlet duct is meshed in order to compute the pressure drop over the nozzles frames in fogging and non-fogging conditions. First, the resistance coefficients of an air intake filter are obtained by numerical and experimental methods, and then the coefficients are used for the simulation of the inlet duct by considering the filter as a porous media. Effects of nozzle spread pattern and water injection pattern are then modeled. The results indicate that injection velocity and arrangement of nozzles could have significant effects on the pressure drop and intake distortion, which will affect compressor performance. This paper provides a comprehensive analysis of the pressure drop and evaporation of inlet fogging and will be of value to gas turbine inlet fogging system designers and users.

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.

Effects of an Injection Angle of Water Pipes in an Ultrasonic Cleaning Tank on Particle Disposal Capability

2014 ◽  
Vol 931-932 ◽  
pp. 1134-1138
Author(s):  
Kitikorn Wongmanee ◽  
Sujin Bureerat ◽  
Julaporn Benjapiyaporn
Keyword(s):  
Fluid Dynamic ◽  
Water Injection ◽  
Flow Simulation ◽  
Particle Dispersion ◽  
Ultrasonic Waves ◽  
Two Phase ◽  
Injection Angle ◽  
Ultrasonic Cleaning ◽  
Water Pipes ◽  
Horizontal Tubes

This paper presents simulation of particle dispersion in an ultrasonic cleaning tank.Contaminants removed from work-pieces by means of ultrasonic waves need to be disposed from the tank during the cleaning process. This is achieved by using water injection from horizontal tubes placed at the bottom inside the tank. It is expected that injection angles could affect the performance of particle disposal. The two-phase flow simulation is adopted to predict disposal capability while the computational fluid dynamic is carried out by means of finite volume analysis. Simulation results of particle dispersion in the tank with various injection angles are conducted, displayed, and concluded.

Flow Characterization of an Industrial Size Francis Turbine Operating at Ultra-Low Load – The Effect of Water Injection

2021 ◽  
Author(s):  
Muhannad Altimemy ◽  
Justin Caspar ◽  
Saif Watheq ◽  
Alparslan Oztekin
Keyword(s):  
Flow Rate ◽  
Pressure Fluctuations ◽  
Water Injection ◽  
Design Flow ◽  
Francis Turbine ◽  
Base Case ◽  
Slight Reduction ◽  
Injection Angle ◽  
Rotation Direction ◽  
Low Load

Abstract Large Eddy Simulations (LES) are carried out for a Francis turbine operating at an ultra-low load with and without injection. The flow rate of the turbine is 40% of the design value. The injection aims to improve turbine operation for the already unstable base case away from the design flow rate. Tangential water injection was introduced through the draft tube wall in the same and opposite runner rotation direction. The injection angle was varied (15°, 30°, 45° and 60°). Two water injection rates were applied at 4% and 8 % of the optimal design flowrate. While injection with the 4% rate and 30° in the opposite runner rotation direction helped reduce pressure fluctuations downstream of the injection inlets; no injection configuration could completely mitigate the power and pressure fluctuations. The injection was found to increase the amplitude of pressure fluctuations close to the injection inlets by 2 to 20 times the magnitude of fluctuations without injection. There was a slight reduction in mean power production (4–10% loss) by injection. The high amplitude fluctuations were observed in power signals with and without the injection.

Performance study of a water ramjet engine

2011 ◽  
Vol 54 (4) ◽  
pp. 877-882 ◽  
Author(s):  
LiYa Huang ◽  
ZhiXun Xia ◽  
JianXin Hu ◽  
QianWen Zhu
Keyword(s):  
Performance Study ◽  
Ramjet Engine ◽  
Water Ramjet

scholarly journals Research on hydrodynamic properties of annular cavitator with water injection

2012 ◽  
Vol 19 (4) ◽  
pp. 11-15
Author(s):  
Zhenyu Jiang ◽  
Min Xiang ◽  
Mingdong Lin ◽  
Weihua Zhang ◽  
Shuai Zhang
Keyword(s):  
Mass Flow ◽  
Pressure Loss ◽  
Water Injection ◽  
Navier Stokes ◽  
Hydrodynamic Properties ◽  
Total Drag ◽  
Surface Mass ◽  
Supercavitating Vehicle ◽  
Injection Water ◽  
Water Ramjet

ABSTRACT Annular cavitator with water injection is one of the key parts of the long-range supercavitating vehiclepowered by water ramjet. In this paper, hydrodynamic properties of annular cavitator are studiednumerically. The standard k ~ ε turbulence model is coupled with the Reynolds Averaged Navier-Stokes(RANS) equations to model the natural supercavitation process. The multiphase flow is considered asa mixture of varying density and modeled by the mass exchange equations. To fully understand this process,numerical simulations were performed for different annular cavitators. Computational Fluid Dynamics(CFD) results, including the pressure distribution and forces acting on the cavitator surface, mass flowand pressure loss of water injection, various supercavity sizes, were obtained and analyzed. The pressuredistribution on the cavitator surface was significantly changed which resulted in 4 ~ 6% increase of thetotal drag of the vehicle. The results show that the mass flow and velocity of the injection water is mainlydependent on the tube size, while the total pressure loss of the water injection is mostly related to the outletpressure. Supercavity generated by annular cavitator is smaller than that of the discal one. Based on thecorrelation analysis of the supercavity size and other factors, it could be concluded that the contraction ofthe cavity size is mainly caused by the diffluent mass flow of the water injection.

Effects of Injection Initial Conditions and Length-to-Diameter Ratio on Fuel Propulsive Droplets Sizing in a Duct

2011 ◽  
Vol 110-116 ◽  
pp. 1784-1792 ◽  
Author(s):  
Mohammad Mahdi Doustdar ◽  
Mohammad Mojtahedpoor ◽  
Mohammad Wadizadeh
Keyword(s):  
Mass Fraction ◽  
Initial Conditions ◽  
Air Flow ◽  
Diameter Ratio ◽  
Fuel Vapor ◽  
Flammability Limit ◽  
Injection Angle ◽  
Cold Flow ◽  
Ramjet Engine ◽  
Length To Diameter Ratio

In this paper an empty cylinder which is as a simulator for a ramjet engine has been studied by a cold flow. The air flow comes into the cylinder from one side and injection operation will be done by four nozzles which are located in the entrance of cylinder. By changing length to diameter ratio and injection angle, we have studied droplet sizing and efficient mass fraction of fuel vapor near and at the exit area. We named the mass of fuel vapor inside the flammability limit as the efficient mass fraction. To fulfill the calculation we used a modified version of KIVA-3V.

Experimental Study on Ignition Process of a Magnesium-Based Water Ramjet Engine

2014 ◽  
Vol 30 (3) ◽  
pp. 857-862 ◽  
Author(s):  
L. Y. Huang ◽  
W. H. Zhang ◽  
Z. X. Xia ◽  
J. X. Hu
Keyword(s):  
Experimental Study ◽  
Ignition Process ◽  
Ramjet Engine ◽  
Water Ramjet

Principle of Conforming Water-Fuel Ratio for Metal Matrix Fuel Water-Ramjet Engine

2010 ◽  
Vol 450 ◽  
pp. 474-477
Author(s):  
Ye Gao ◽  
Ping An Liu ◽  
Ge Wang ◽  
Liu Han
Keyword(s):  
Nozzle Exit ◽  
Specific Impulse ◽  
Minimization Method ◽  
Water Steam ◽  
Fuel Ratio ◽  
Ramjet Engine ◽  
Vaporization Temperature ◽  
Performance Ability ◽  
Value Of It ◽  
Water Ramjet

When water-ramjet engine working, its water-fuel ratio is needed to conform. Taking magnesium-based fuel for example, thermodynamic parameter of different formulation fuel under different water-fuel ratio was calculated with the free energy minimization method. It was found that the effective specific impulse of water-ramjet engine increased first and then decreased with the increasing of water-fuel ratio, so there was the maximum value of it, named optimum specific impulse. The corresponding water-fuel ratio was the best one, and then the performance ability of water-ramjet engine was the maximum one. The temperature of nozzle exit gradually decreased with the increasing of water-fuel ratio. When the temperature was lower than local vaporization temperature, water steam coagulated and it would cause the thrust force to decline. Therefore, when the water-ramjet engine is designed, the value of water-fuel ratio can't exceed the best water-fuel ratio by the premise of guarantee of the temperature of nozzle exit as high as possible.

STUDY ON SUBCOOLED WATER INJECTION INTO MOLTEN MATERIAL

1998 ◽  
Author(s):  
Hyun Sun Park ◽  
Norihiro Yamano ◽  
Kiyofumi Moriyama ◽  
Yu Maruyama ◽  
Yanhua Yang ◽  
...  
Keyword(s):  
Water Injection ◽  
Molten Material ◽  
Subcooled Water
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