Rocket injector anomalies study. Volume 1: Description of the mathematical model and solution procedure

The capability of simulating three dimensional two phase reactive flows with combustion in the liquid fuelled rocket engines is demonstrated. This was accomplished by modifying an existing three dimensional computer program (REFLAN3D) with Eulerian Lagrangian approach to simulate two phase spray flow, evaporation and combustion. The modified code is referred as REFLAN3D-SPRAY. The mathematical formulation of the fluid flow, heat transfer, combustion and two phase flow interaction of the numerical solution procedure, boundary conditions and their treatment are described

Thermodynamic analysis of Spark Ignition engines using the Entropy Generation Minimisation method

The recent improvement on Spark Ignition Engines has been the result of improved engine thermodynamic cycles, made possible by advances in technologies such as Variable Valve Timing (VVT) and Variable Compression Ratio (VCR). To evaluate the potential of these techniques a thermodynamic analysis is made. Numerical models were implemented in Matlab Simulink using the laws of thermodynamics and include heat transfer, combustion, real working fluid characteristics and intake and exhaust events. The second law analysis allowed the identification of inefficiency sources and directions for improvement. A SI engine was analysed and its processes were evaluated by the amount of entropy generated

An Experimental Investigation On Converting Conventional to Supercharged CI Engine

Due to the increase in grounds performance of internal combustion engines, the diesel engine has become dominant forces in the power, propulsion, and energy. For domestic, industrial, and transportation applications, internal combustion engines are the more reliable and misogynist power source. Diesel engines rely on fluid Spritz dynamics for air-fuel mixtures and swirl plays a crucial role in the pattern of air motion as impacts fuel air mixing and combustion. Further-more, older studies have indicated that it affects heat transfer, combustion efficiency, and engine emissions. By varying air inlet pressure, this work demonstrates the presentation and production features of Compression Ignition engines. Using compressor, the inlet pressure of air is manipulated, and when compressed air is sent to engine at different pressures, performance parameters and heat balance sheets are calculated

An Experimental Investigation On Converting Conventional to Supercharged CI Engine

Due to the increase in grounds performance of internal combustion engines, the diesel engine has become dominant forces in the power, propulsion, and energy. For domestic, industrial, and transportation applications, internal combustion engines are the more reliable and misogynist power source. Diesel engines rely on fluid Spritz dynamics for air-fuel mixtures and swirl plays a crucial role in the pattern of air motion as impacts fuel air mixing and combustion. Further-more, older studies have indicated that it affects heat transfer, combustion efficiency, and engine emissions. By varying air inlet pressure, this work demonstrates the presentation and production features of Compression Ignition engines. Using compressor, the inlet pressure of air is manipulated, and when compressed air is sent to engine at different pressures, performance parameters and heat balance sheets are calculated

Investigation of the Effect of the Temperature of Intake Air on the Economy and Torque of a Gasoline Engine

The object of this investigation is to make a study of the effect, on the economy and torque of a gasoline motor, of heating the air going to the carburetor. The knowledge gained from such an investigation is of considerable importance and might be used in determining the temperature at which to supply air to the carburetor of a motor in order to get the best results under its working conditions. General practice indicates that a motor will run more smoothly and first regularly when the temperature of the intake air is 150 degrees or more. The theory is that up to a certain point, the economy becomes better with increasing air temperatures. The brake horsepower, however, falls off as the temperature is raised. Assuming then that we have an unlimited heating source, it is our purpose to find the best temperature to use in order to obtain the highest economy without seriously reducing the torque. Also the effects at various loads and speeds will be considered. With the poor grade of gasoline now being supplied, this investigation should be of the utmost value

Application of Meshless Methods for Thermal Analysis

Many numerical and analytical schemes exist for solving heat transfer problems. The meshless method is a particularly attractive method that is receiving attention in the engineering and scientific modeling communities. The meshless method is simple, accurate, and requires no polygonalisation. In this study, we focus on the application of meshless methods using radial basis functions (RBFs) — which are simple to implement — for thermal problems. Radial basis functions are the natural generalization of univariate polynomial splines to a multivariate setting that work for arbitrary geometry with high dimensions. RBF functions depend only on the distance from some center point. Using distance functions, RBFs can be easily implemented to model heat transfer in arbitrary dimension or symmetry

Advanced oxygen-hydrocarbon rocket engine study

Preliminary identification and evaluation of promising liquid oxygen/ hydrocarbon (LO2/HC) rocket engine cycles is reported. A consistent and reliable data base for vehicle optimization and design studies, to demonstrate the significance of propulsion system improvements, and to select the critical technology areas necessary to realize such advances is presented