Rockets

The phenomenon and the disciplines of the engine have occurred during the operation of the rocket engine. Branch disciplines in internal ballistics. The rocket engine is widely used is a solid propellant rocket engine and liquid propellant rocket engine with chemical energy. The inner ballistic process starts from the ignition, the engine utilizes the oxidant and combustion carrying itself, in the combustion chamber by chemical reaction, chemically converted into thermal energy, producing high-temperature and high pressure gas, gas in the nozzle, expanded acceleration, The high speed is sprayed from the nozzle outlet, achieving part of the process of transformation into kinetic energy, thereby generating anti-force thrust, driving the rocket forward. The ignition and combustion mechanism of the propellant, the flow of the gas in the combustion chamber, the abnormal combustion mechanism of the combustion chamber, the changes of physical quantities such as the physical quantity, etc. of the combustion chamber, the variation of the inner flow field change, the thrust adjustment and control mechanism, performance Parameter calculation, energy conversion in rocket engines and conversion efficiency, etc. For other energy rocket engines, such as electric rocket engines, nuclear rocket engines, laser rocket engines and solar rocket engines, focusing on the interaction process and energy conversion law of internal electricity, nuclear, light and works in the reactor, and energy conversion. To improve the engine's specificity and efficiency. Including experimental research, theoretical analysis and numerical simulation. Experimental research, mainly through experimental research on the changes of changes in combustion indoor stress and routine of rocket engines; theoretical analysis, mainly based on the type of rocket engine studies, establish corresponding internal ballistic theory models, analyzes the main performance of the engine; Simulation, mainly zero-dimensional, one-dimensional, two-dimensional and three-dimensional single-phase flow or two-phase flow inner ballistic simulation, predict the internal flow field and performance parameters of the engine, provide the necessary data for the engine design. Rockets are important in the design of the Rocket Promotion System: 1 Rocket Timetics is the foundation of Rocket Engine Design. The design of the rocket engine must first be studied in rocket. 2 The indicator parameters given by the inner ballistics in the rocket are the basis for judging the performance of the rocket engine and is also the basis for identification and acceptance rocket engines. Excellence, thrust coefficient, jet speed, feature speed, total impulse and complimentary parameters are the main parameters of judging and acceptance rocket engine performance. 3 Rockets inner ballistic indicator parameters are important factors affecting rocket performance. For example, the larger speed ratio of the rocket engine is more large, the greater the rocket, and the farther the range is also. 4 Rockets Timinals are the basic basis for exploring new concept rocket engines. From the basic principles of the ballistics in the rocket, explore and develop new engines is a very important task in promoting technical research. For example, a laser promotes a rocket engine, and the electrical propulsion rocket engine is proposed in the basic principles of the ballistics in the rocket. Since the rocket engine appears, people began researching the inner ballistics, and develop the theoretical and testing techniques of the corresponding rockets in accordance with different types of rocket engines. By the 1990s, the discipline system for developing rockets in the system. The trend of the ballistic in the rocket is: 1 Improve the theoretical system. For example, develop three-dimensional, two-phase reaction turbulent internal ballistic theory, and portray the inner ballistic process in more detail. 2 Solve problems in the new concept rocket engine. For example, an electrical rocket engine requires the study of the interaction process of the plasma and the work quality and the flow of the plasma in the nozzle.

Publisher: China Military Encyclopedia Book Review Room