Ramjet Part 2 – Engine Cycle and Thrust

I have finally figured out that WordPress supports LaTeX, so that makes putting in endless streams of equations much easier! The ideal ramjet engine operates on a Brayton Cycle which is characterised by constant pressure combustion followed by expansion of the combustion products to near ambient pressures. The enthalpy-entropy diagram for this engine cycle is... Continue Reading →

Ramjet Part 1

The basis for all the rocketry and wind tunnel posts discussed  previously are primarily for the development of a micro-ramjet engine. For now I have gone as far as I can on the supersonic wind tunnel and the design has more or less been finalised, all the tunnel wall contours for the test sections are... Continue Reading →

Initial Nozzle Design

The most critical part of the wind tunnel is the nozzle, it must accelerate the flow to the desired Mach number while leaving the test section free of shock waves. The two methods I have used have been a numerical technique to create the geometry and later on I'll use computational fluid dynamics (CFD) to... Continue Reading →

Supersonic Wind Tunnel part 1

  Previously I had mentioned the use of water flow to simulate supersonic flow, however after having done some research I've abandoned this approach for now in favour of building a supersonic wind tunnel. The main reason for this is I'd like to some investigation on combustion stability at the small scale I want to... Continue Reading →

Solid Fuel Regression Part 2..

So in this second of my posts on solid fuel grain regression I'll cover more complex grain core shapes, although the process is not overly dissimilar to the methods discussed previously. An average web length is found and an incremental distance is then defined, this distance is then used to regress each point of the... Continue Reading →

Solid Fuel Regression Part 1

In the first of a series on the modelling of rocket motors I'm going to cover the aspects of the design of the solid propellent grain, which is the hardened mass of combustible propellent within the motor itself. Solid fuel rocket motors range from the model rocket motors produced by the likes of Estes with their... Continue Reading →

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