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A hot-fire test of an experiment-scale Kero/GOX liquid rocket engine is carried out. Numerical simulation on the basis of the experiment is calculated with the purpose of verifying the validity of the numerical simulation model in this paper. After that, high frequency instability induced by the distribution of gas-liquid scheme injectors is studied numerically. There are three injectors distribution...
Computer modelling and simulations are commonly used for analyzing complex systems such as launch vehicle propulsion system. The main objective of this research is to obtain a mathematical model for simulation of staged combustion cycle liquid propellant rocket engines (LPRE). For this purpose, using modular simulation concept, the engine major components are divided into eight main modules and the...
As we continue toward exascale, scientific data volume is continuing to scale and becoming more burdensome to manage. In this paper, we lay out opportunities to enhance state of the art data management techniques. We emphasize well-principled data compression, and using it to achieve progressive refinement. This can both accelerate I/O and afford the user increased flexibility when she interacts with...
Multi-pulse fuel injection in diesel engines enables a large flexibility in controlling the fueling profile, such that the engine performance can be maintained subject to disturbances, i.e., ambient condition changes and fuel injection deviations. Based on linearized systems, current fuel injection controller synthesis methods do not consider ambient condition changes as well as the nonlinear impact...
As the number of combined-cycle units increases, efficient modeling approaches for these units play important roles for independent system operators (ISOs). Based on various combinations of combustion turbines (CTs) and steam turbines (STs), the combined-cycle unit could work at different configurations (modes) with different efficiencies. In this paper, we propose an edge-based formulation for the...
Promising low-temperature vortex (LTV) technology was studied. P-49 boiler model was created with use of application software package FIRE 3D. Source data influence evaluation on inside furnace processes was one of the main goals of the conducted research. Some construction simplifications were accepted in the model. Aerodynamic, temperature and oxygen concentration diagrams were analysed.
The performance optimization of a reverse flow combustor in a mini-jet engine is studied numerically. Different turbulence models (with appropriate mesh resolutions), i.e. steady (RANS) and unsteady k-ε (URANS) and the Reynolds stress model is adopted to investigate and compare the performance of the combustor. The probability density function (PDF) model is used to include combustion to complete...
With the application of multiple-pulse fuel injection profiles, the performance of diesel engines is enhanced in terms of low fuel consumption and low engine-out emission levels. However, the calibration effort increases due to a larger number of injection timing parameters. The difficulty of controlling the combustion phase also increases because of coupling between individual fuel injection pulses...
Diesel-fuelled compression ignition engines find wide range of applications from light duty to heavy duty engines, also exhibiting higher fuel conversion efficiencies than that of petrol-fuelled spark-ignition engines. However, diesel engines suffer from high NO and soot emissions with trade off, making the development of high efficiency and less polluting engines a necessity. Hence understanding...
A novel approach for OH-PLIF image processing, namely conditioned level-set (CLS) method, is presented in this paper. The complete CLS method consists of raw image pre-processing, adaptive intensity shareholding for linearization, initial contour extraction, region-lock optimization and level set iteration. The successful application of this method to typical molecule diffusion flames demonstrates...
The characteristics of the flow, combustion and temperature in a 300 MWe tangentially fired pulverized-coal furnace are numerically studied using Computational Fluid Dynamics (CFD). Turbulent model needs to be properly studied and selected to generate accurate predictions of flow and heat transfer during combustion. In the present work, a comparative study is performed to identify the suitable turbulence...
The accurate measurement of oxygen content in the flue gas at a coal-fired power plant is important for the plant operators to realize closed-loop and optimal control. In this paper, eight zirconium oxygen analyzers were used to measure the oxygen content in the flue gas under real plant conditions. A cloud model is incorporated into the measurement system. In consideration of the temporal and spatial...
This work study the influence of the light refraction in the apparent broadening of species experimental profiles in counterflow premixed flames. In fact, in a counterflow premixed flame, is generated a layered medium by the temperature gradient which induces a change in the milieu refractive index, causing a deviation of rays emitted by each point of the flame, and therefore producing a broadening...
This paper takes the dichloropropane tank area in a chemical company in service for an example, and adopts the fire simulation software FDS to make numerical simulation for the whole-area pool fire accident in the dichloropropane tank. The variation of flame and the flue gas in the combustion process of pool fire is obtained from the simulation. For the flame, in the early pool fire, the flame is...
As an internal combustion engine, automotive gasoline engines involve nonlinearities and stochastic characteristics that are usually difficult to handle in modeling and control. To promote the applications of advanced control theory in the engine systems, The SICE Technical Committee on Advanced Control of Automotive Powertrains proposed a benchmark problem that targets the starting speed control...
The numerical simulation of the gas flow in a small-sized vaporizing burner was completed based on STAR-CD, and the flow of the burner's main region was analyzed. According to the computation and analysis, some conclusions are drawn as follows: the primary air entering the glow plug chamber can promote mixture of the vaporizing oil on oil net; the secondary air produced in the tangential inlet bent...
The supersonic combustion chamber with Shuttle-type cavity was investigated numerically and experimentally. The symmetry of Shuttle-type cavity is discussed in this paper. Results show that the symmetry is determined by the number of low-pressure centre area. Mach number of main flow is the key factor that determines the symmetrical characteristic of Shuttle-type cavity flow field and the critical...
A numerical study to a pulverized coal burner of low load with non-premixed combustion model has been made to examine the flow field and recirculation zone in cold and thermal states with three different blocking rates of bluff body. The simulation of blocking rates of bluff body with 1.070 has the biggest recirculation velocity. The simulations of thermal state show that bluff body has some kind...
A new rapid premixed pre-evaporation model nozzle is designed in this paper. The nozzle performances such as mixed effect, average evaporation time of droplet and total pressure loss, heat and mass transfer, and flameless combustion characteristics etc. are CFD numerical predicted. The results provide some references for the new premixed flameless combustion mode.
Furnace temperature is one of the most important industrial indicators in refinery cavities. This paper makes a simulation of temperature distribution inside a vertical cylindrical tube furnace called F101 cavity, which is on running in Harbin Petrochemical Company, with computational fluid dynamics method. Computational simulation results show a good accordance with the monitor data in the field,...
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