Numerical Simulation on Two Phase Combustion Characteristic in Solid Rocket Ramjet Afterburning Chamber

2013 ◽  
Vol 774-776 ◽  
pp. 737-742
Author(s):  
Nai Fei Zhang ◽  
Yi Hua Xu ◽  
Zhuo Xiong Zeng ◽  
Ben En Xu
Keyword(s):  
Numerical Simulation ◽  
Particle Trajectory ◽  
Particle Diameter ◽  
Combustion Efficiency ◽  
Combustion Characteristic ◽  
Two Phase ◽  
Afterburning Chamber ◽  
Solid Rocket ◽  
Inlet Angle ◽  
Particle Trajectory Model

Numerical simulation on two-phase combustion characteristic in afterburning chamber of solid rocket ramjet was carried out by applying particle trajectory model. It was analyzed that the nozzle number of secondary combustion chamber, inlet angle of air and particles diameter impact on efficiency of combustion. Results show that the combustion efficiency in the afterburning chamber is highest, achieving 99.6% when the angle between both air inlets is 180°, particle diameter is 15μm, and 5-hole nozzle is used. By contrary, when the angle between both air inlets is 90°, particle diameter is 5μm, and 5-hole nozzle is used, the afterburning chamber has a lowest combustion efficiency of 70.3%.

Numerical Simulation of 3-D Chemical Non-Equilibrium Flow in the Afterburning Chamber of Solid Ducked Rocket

2011 ◽  
Vol 130-134 ◽  
pp. 3151-3154
Author(s):  
Li Kun Cui ◽  
Yong Zhi Zhang ◽  
Zhuo Li
Keyword(s):  
Numerical Simulation ◽  
Radical Reaction ◽  
Combustion Efficiency ◽  
Equilibrium Flow ◽  
Air Inlet ◽  
Afterburning Chamber ◽  
Inlet Angle ◽  
Fundamental Equations ◽  
Combustion Processes ◽  
Non Equilibrium

In order to reveal the complex turbulent combustion processes in the afterburning chamber of Solid Ducked Rocket (SDR), Based on the fundamental equations of hydrokinetics and elementary principles of radical reaction kinetics, using multi-component chemical reaction equation of containing Mg and Al components, the numerical simulation of chemical non-equilibrium flow in the afterburning chamber of SDR is processed and effects of the air inlet angle on the afterburning chamber is studied by using Fluent software. The results show that pressure distribution is more balanced, temperature distribution is very uneven and flow is extremely complicated in the afterburning chamber. Combustion efficiency can be increased by improving the air inlet angle.

Numerical Simulation of Gas-Solid Two-Phase Flow in Air Pre-Cleaner Based on CFD

2013 ◽  
Vol 834-836 ◽  
pp. 1423-1427
Author(s):  
Gui Yang Dong ◽  
Ye Fa Tan ◽  
Hong Wei Li ◽  
Chun Hua Zhou ◽  
Wei Gang Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Moving Boundary ◽  
Particle Trajectory ◽  
Internal Flow ◽  
Computational Grids ◽  
Particle Phase ◽  
Two Phase ◽  
Sliding Mesh ◽  
Cell Source ◽  
Particle Trajectory Model

Computational grids of the complex internal flow passage in air pre-filter were generated, using the partitioned mixed grids. Based on the method of user-defined functions controlling sliding mesh, a program of defining moving boundary was proposed, and numerical simulation of the rotor movement transient controlled by the flow field of air pre-filter was achieved. Based on the theory of Euler-Lagrange phase flows, stochastic particle trajectory model and cell source method were adopted to calculate the trajectories and concentration distributions of particle phase in air pre-filter.

Numerical Simulation and Experimental Validation on the Particle Trajectory in a Solid Propellant Rocket Chamber

2000 ◽  
Author(s):  
Yumin Xiao ◽  
R. S. Amano ◽  
Timin Cai ◽  
Jiang Li
Keyword(s):  
Numerical Simulation ◽  
Experimental Method ◽  
High Speed ◽  
Particle Trajectory ◽  
Two Phase Flow ◽  
Measurement Data ◽  
Special Method ◽  
Phase Flow ◽  
Two Phase ◽  
Particle Injection

Abstract In solid rocket motors (SRMS) using aluminized composite solid propellants and submerged nozzles a two-phase flow pattern is one of the main flow characteristics needs to be investigated. The modeling and validation of two-phase flow are the focus in this research field. In this paper the authors first traced the particle trajectory in a SRM chamber by using numerical method, and then developed a new experimental method to measure the particle trajectory in a SRM chamber to validate the numerical results. The experimental method was based on the RTR (X-ray Real-time Radiography) technique and high-speed motion analyzer. A special method was developed to imitate the particle injection on the propellant surface. The calculation results and measurement data show that the trajectory obtained by numerical simulation was in good agreement with the measured one by imposing proper boundary conditions. For particles with diameter of 75μm, the initial velocity factor of particle is approximately 0.4, and the particles pass through the centerline in both calculation and experiment. The present method can be extended to study the impingement of particles on the wall and other related two-phase flow patterns.

Numerical Simulation of Flow Field Characteristics of Free Falling Particle Plume Affected by Particle Diameter and Density

2014 ◽  
Vol 894 ◽  
pp. 163-166 ◽  
Author(s):  
Ze Qin Liu ◽  
Ling Yu Liu ◽  
Xiao Jian Li
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Particle Density ◽  
Fluid Dynamic ◽  
Particle Diameter ◽  
Ambient Air ◽  
Two Phase ◽  
Flow Field Characteristics ◽  
Computational Fluid Dynamic Software ◽  
Free Falling

The study of flow field characteristics of free falling particle plume is part of the basic application research of gas-solid two phase flow. The Computational Fluid Dynamic Software FLUENT was adopted in this paper. The numerical simulation was carried out to study the influence of particle diameter and particle density to the particle flow field characteristics of free falling particle plume. The results of the numerical simulation showed that, with the increasing of particle diameter and the increasing of particle density, the disturbance of ambient air to the particle plume decreased, and the entrainment ability of particle plume to the ambient air was diminished.

Numerical Simulation of Sand Erosion in Steam/Water Separator

2003 ◽  
Author(s):  
Susumu Kato ◽  
Kazuyuki Toda ◽  
Makoto Yamamoto ◽  
Motoaki Shito ◽  
Masafumi Kawai
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Solid Particle ◽  
Particle Trajectory ◽  
Particle Diameter ◽  
Numerical Results ◽  
Wall Surface ◽  
Diameter Range ◽  
Sand Erosion ◽  
Water Separator

This paper presents an investigation into a phenomenon that happened on the wall surface of a Steam / Water Separator (SWS). It was reported that erosion caused from unknown solid particle took place on the SWS wall. In order to capture this sand erosion phenomenon numerically, the SWS flow field was solved, and then particle trajectory and wear quantity were calculated, based on the CFD results. Several wall and particle materials and also the combinations of them are assumed. Furthermore, the particle diameter was varied from 10−6 to 10−2 m. The numerical results insist that the particle, which could be the factor of the phenomenon, is limited in its diameter range and its material. The present study will be an aid to clarify the cause of sand erosion in a SWS.

Numerical Simulation Research on Optimizing Blended- Anthracites Combustion in W-Shaped Flame Boiler With Direct-Fired Pulverizing System

2011 ◽  
Author(s):  
G. M. Zhu ◽  
B. Yao ◽  
Q. F. Jiao ◽  
X. N. Duan ◽  
Z. J. Wu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Mixture Fraction ◽  
Operation Mode ◽  
Side Wall ◽  
Combustion Efficiency ◽  
Combustion Characteristic ◽  
Outlet Temperature ◽  
Essential Difference ◽  
Furnace Temperature

Two modes could be adopted such as pulverizing coal in different mills’ and ‘blending before furnace’. When blending different kind of coal, for “blending before furnace ’that means the different coals are blended previously before they are transported into Coal bunker and different mills pulverize same raw coal; on the other hand, Pulverizing coal in different mills’ means that different raw coals enter different mills, that is to say, different mills pulverize different raw coal. It is often held that it is unnecessary to optimize coal-blending mode since there are no essential difference of combustion characteristic etc. between anthracites. To determine the necessity of optimize mode when blending one anthracite with another anthracite, numerical simulation is carried out under different conditions using dual-mixture fraction/PDF approach. The calculated result shows that the furnace temperature field, oxygen distribution and velocity field are quite symmetrical under the ‘blending before furnace mode. But In contrast of that on the mode of pulverizing coal in different mills, the burn-off degree of powder coal and furnace outlet temperature are much lower. Even if using the same ‘pulverizing coal in different mills’ mode, if the mills running mode is changed, the efficiency of the boiler exist a gap from one to another. The simulation results prove that ‘pulverizing coal in different mills’ can enhance the combustion efficiency of boiler greatly even when one kind of anthracite is blended with another kind of anthracite. The operation mode of the coal-mills affect the furnace temperature field clearly and it could decrease coking tendency when the coal which is prone to be coked and so it is arranged far from the side wall of furnace.

Numerical Simulation of the Two-Phase Flow in a New Type Cyclone

2011 ◽  
Vol 201-203 ◽  
pp. 263-266 ◽  
Author(s):  
Ning Ning Xing ◽  
Wei Lin Zhao
Keyword(s):  
Numerical Simulation ◽  
Gas Flow ◽  
Particle Trajectory ◽  
Swirling Flow ◽  
Flow Characteristics ◽  
Cement Plant ◽  
Phase Flow ◽  
Two Phase ◽  
New Type ◽  
Fluent Software

A new type cyclone with oblique top, transitional volute chamber, eccentric inner cylinders and sloping outlet were designed and manufactured by numerical analysis, which had been applied to the five-stage preheater in the cement plant with the capacity of 5000t/d. To simulate the gas flow field and particle trajectory in cyclone, the Fluent software was used, and the RNG k-ε model and discrete random walk model were proposed. The flow characteristics of gas-solid two-phase were analyzed. It is found that the strongly swirling flow occurs in the new type cyclone, and the particles of raw meal can be more efficiently separated from the gas.

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