As the air travels farther along the cone, the more speed it bleeds off. The air is now slowed although still supersonic. As the slowed, but still supersonic, air continues to move farther into the engine, the normal shock wave occurs between the inlet throat and the engine compressor—the precise
The air goes through the core of the engine as well as around the core. This causes some of the air to be very hot and some to be cooler. The cooler air then mixes with the hot air at the engine exit area. This picture shows how air flows in an
engine car giving an average of 15 kmpl” The working of the engine is explained theoretically below. To convert a conventional IC engine into an Air Powered one, replace the spark plug with a pulsed pressure control valve which can create required pressure. A PLC circuit would be used to control the flow of electrical supply to the plunger which will help in controlling the pulse air firing in the valve, hence giving control over speed of engine. Now fuel tank is to be replaced with air vessel, as it requires pressurized air as input. And two things are to be taken care while designing air vessel: 1) First is its strength to withstand high internal pressure, which exists due to compressed air.
To present day a major disadvantage of a ramjet is the cooling down process because it’s extremely difficult to cool down a used ramjet. This is because after high amounts of burning fuel and pressures are present this naturally heats up the jet engine. The difficulty of a ramjet is the intake of air has to be kept at subsonic speeds or else there can be possible risks of stability and functioning of the jet engine. From this the loud noises that are produced from the process make testing of ramjets nearly impossible, as it’s very difficult to keep stable. Stating from engines.fighter-planes.com the cost of testing ramjets are more expensive than the actual build and maintenance cost as special sealed of hangers must be built for testing to take place.
Figure 55 demonstrates the variation of the in-cylinder peak pressure with load for six different types of fuel. As it can be observed, the peak pressure increases with increasing the engine load. The reason behind that is that the mass flow rate of air is kept constant when the engine speed is steady ( =1700 rpm in this case) ,however the amount of fuel injected is increasing , thus the rate of mixing between air and fuel is lower which delays the ignition period
Throttle valve A device that controls the flow of fuel and the power the engine makes. Sometimes a throttle valve is reffered to as a butterfly. As the gas pedal is depressed, the throttle opens allowing more air and fuel to enter the combustion chamber and resulting to more power. In a fuel injection system, this valve controls the flow of air only as the vehicle's on-board computer regulates the fuel
III. CONCEPT OF THE ADAPTIVE WIND TURBINE In this section, the design of the wind turbine is explained. This device features an Inner Compression Cone Technology, which will squeeze and compress the incoming air in order to create more power in the turbine. Compressed Air Enclosed Wind Turbine completely eliminates the three massive blades seen on most wind turbines. The blades are internal, closer together and smaller.
Disadvantages of two stroke engines 1. Exhaust and inlet parts are open simultaneously and some fresh charge is likely to escape without work output. 2. Thermal efficiency of two stroke is lower due to some charges escaping without burning, decreases performance and slow combustion pressure. 3.
The sudden impact of gases at high pressures on the wall of blast hole causes the shock wave to be transmitted into the rock mass. The outgoing shock wave generates the fracture in the surrounding rocks, provided the intensity of the stress is greater than the dynamic compressive strength of rock (Hagan, 1973). It also develops radial fractures due to tangential and tensile stresses (Johansson and Persson, 1970). Upon meeting an open joint or a free face, the compressive stress wave gets reflected and spalling occurs if the intensity of the tensile wave exceeds the dynamic tensile strength of the rock (Hino, 1956; Duvall and Atchison, 1957). The reflections of the compressive wave generate tensile and shear waves, which may propagate through pre-existing cracks and further widens them apart (Fourney, 1993) due to the phase difference between the two wave types.