Users' questions

What is the principle of ramjet?

What is the principle of ramjet?

The ramjet engine is an air breathing engine which operates on the same principle as the turbojet engine. Its basic operating cycle is similar to that of the turbojet. It compresses the incoming air by ram pressure, adds the heat energy to velocity and produces thrust.

What is ramjet explain the working of a ramjet with a neat sketch?

it’s job is to decrease the velocity & increase pressure of incoming air. The fuel injected into combustion chamber is burned with help of flame igniter. The high pressure and high temperature gases are passed through the nozzle converting into pressure energy into kinetic energy.

What sets an upper limit on the temperature of combustion in the ramjet?

Thermodynamic conditions in the ramjet combustor in terms of inlet pressure and temperature will determine the upper limit due to the low combustion efficiency.

Which is not present in ramjet engine?

In a ramjet, the high pressure is produced by “ramming” external air into the combustor using the forward speed of the vehicle. In a turbojet engine, the high pressure in the combustor is generated by a piece of machinery called a compressor. But there are no compressors in a ramjet.

Where is ramjet used?

Ramjets can be particularly useful in applications requiring a small and simple mechanism for high-speed use, such as missiles. The US, Canada, and UK had widespread ramjet powered missile defenses during the 1960s onward, such as the CIM-10 Bomarc and Bloodhound.

What is the use of ramjet app?

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How high can a ramjet fly?

These then take it up to about 30 kilometers (100,000 feet) and Mach 5, at about which point they will—should—flame-out and are parachuted back for re-use….by John Hollaway. Monday, February 4, 2019.

Altitude Sea Level 30 km
Ramjet air mass flow, kg/hr 24,056 4,971

How does a dual mode ramjet work?

A Dual Mode Ramjet is a Propulsion System which, dependent on the Flight Mach Number, operates in two Modes. An “Isolater” is required for lower Mach operation to provide a Combustor Entrance Pressure higher than the Combustion Pressure. Mode 2: As a Scramjet With Supersonic Combustion.

Why it is called ramjet?

The ramjet gets its name from the method of air compression-, it cannot operate from a standing start but must first be accelerated to a high speed by another means of propulsion. The air enters the spike-shaped inlet and diffuser (fig. 70) which serve the same purpose as the compressor.

What are the main parts of ramjet engine?

In its most basic form, a ramjet has very few moving parts and, because of this simplicity, is often referred to as a “flying stovepipe”. The engine consists of an air intake, a combustor and an exhaust nozzle. A high speed object moving through the air generates a high pressure region in front of it.

How does the thermodynamics of a ramjet work?

To understand how a ramjet works, we must study the basic thermodynamics of gases . Gases have various properties that we can observe with our senses, including the gas pressure p , temperature T , mass, and volume V that contains the gas.

How is stagnation pressure measured in a ramjet?

Using , in the expression for stagnation pressure, The ratios of stagnation pressure to static pressure at inlet and exit of the ramjet are The ratios of stagnation to static pressure at exit and at inlet are the same, with the consequence that the inlet and exit Mach numbers are also the same.

Which is better a scramjet or a ramjet?

A better choice for an air-breathing propulsion system would be a ramjet for Mach numbers less than 6, and a scramjet for Mach numbers greater than 6. Ramjets and scramjets rely on the forward speed of the vehicle to compress the air in the inlet instead of using the mechanical compressor of a gas turbine.

How does the normal shock work in a ramjet burner?

For the ramjet, there is a terminal normal shock in the inlet that brings the flow to subsonic conditions at the burner. As speed increases, the losses through this shock eventually decrease the level of pressure that can be achieved in the burner, and this sets a limit on the use of ramjets.

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