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Force-System Resultants and Equilibrium
Published in Richard C. Dorf, The Engineering Handbook, 2018
Specific impulse - The amount of thrust force obtained from a fuel/oxidizer/engine combination when a unit weight of fuel is burned in 1 second. The units of specific impulse are seconds because the force and weight units cancel.
Exhaust System
Published in Ahmed F. El-Sayed, Aircraft Propulsion and Gas Turbine Engines, 2017
Thrust vectoring is the ability of an aircraft or other vehicle to direct the thrust from its main engine(s) in a direction other than parallel to the vehicle’s longitudinal axis. Thrust vectoring is a key technology for current and future air vehicles. The primary challenge is to develop a multi-axis thrust-vectored exhaust nozzle, which can operate efficiently at all flight conditions while satisfying the design constraint of low cost, low weight, and minimum impact on radar cross-section signature. The technique was originally envisaged to provide upward vertical thrust as a means to give aircraft vertical takeoff and landing (VTOL) or short takeoff and landing (STOL) capability. Subsequently, it was realized that the use of vectored thrust in combat situations enabled an aircraft to perform various maneuvers and have better rates of climb not available to conventional-engined planes. Additionally, which is most important, thrust vectoring can control the aircraft by engine forces, even beyond its stall limit, i.e., during “impossible” post-stall (PS) maneuvers at extremely high-nose turn rates [11]. An interesting “definition” for thrust vectoring is introduced in Reference 12 as a maneuver effector that can be used to augment aerodynamic control moments throughout and beyond the conventional flight envelop. Rockets or rocket-powered aircraft can also use thrust vectoring. Examples of rockets and missiles that use thrust vectoring are the space shuttle SRB, S-300P, UGM-27 Polaris nuclear ballistic missile, and Swingfire small battlefield.
How Do Rockets Work?
Published in Travis S. Taylor, Introduction to Rocket Science and Engineering, 2017
First and foremost, thrust is a force and is measured in newtons (N). Older rocket scientists might often revert to using pounds of thrust, but we will stick to the International System of Units here. It is a force generated by some propulsive element in order to overcome other forces acting on a body in order to manipulate that body’s position and velocity vector. It is the force that is used to propel a rocket or a spacecraft to the destination trajectory or orbit or the landing site desired. Airplanes use propellers or jet engines to generate thrust. Rockets use rocket engines to generate thrust.
Computational investigation of cooling effectiveness for film cooled dual-bell exhaust nozzle for LO2/LH2 liquid rocket engines
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2021
Martin Raju, Abhilash Suryan, David Šimurda
Specific impulse () is the thrust generated by a rocket engine per weight flow rate of fuel consumed. Specific impulse loss due to secondary coolant injection is due to the excess fuel consumption used to cool the nozzle walls. As the coolant is injected at the inflection, which is situated downstream from the inlet of DBN, it does not take part in the combustion process unlike in case of combustion chamber cooling (Batha et al. 1963). Specific impulse is calculated using the equation given below:
Design and analysis of Coanda effect nozzle with two independent streams
Published in International Journal of Ambient Energy, 2020
This project is all about dealing with thrust vectoring in vertical short take-off and landing (V/STOL). In general, thrust is the main force which helps in the motion of the aircraft. Thrust vectoring is the ability of the aircraft, rocket or other vehicle to manipulate the direction of the thrust from its engine or motor in order to control its attitude or angular velocity of the vehicle. In practice, for thrust vectoring, mechanical components are used. This project helps in removing the mechanical components for thrust vectoring.