Ricardo WAVE is a computer-aided engineering code developed by Ricardo Inc. to analyse the dynamics of pressure waves, mass flows, and energy losses in ducts, plenums and the intake and exhaust manifolds of various systems and machines. WAVE provides a fully integrated treatment of time-dependent fluid dynamics and thermodynamics by means of a one-dimensional, finite difference formulation incorporating a general thermodynamic treatment of working fluids, including air, air-hydrocarbon mixtures, products of combustion, freons, and liquid fuels. In addition, WAVE provides a completely coupled interface to Ricardo’s CFD code, VECTIS, which allows various system components to be simulated as a full three-dimensional model. Finally, WAVE provides a completely coupled interface to external models which are user defined to specially describe the physics in a system component. The code provides detailed printed output of a large number of key parameters of engineering importance. This includes integrated quantities such as time-mean pressures, temperatures and flow rates at many locations within the duct/manifold network. In addition, the time variation of important variables is available in the form of detailed plots through simple input specifications. Variables such as mass flow, velocity, composition and thermodynamic parameters throughout the duct system are available for plotting.
(a)In the Lab;
● Follow the instructions given in the tutorial guide to simulate the single cylinder engine model.
● Develop the single cylinder into a four cylinder model and perform the necessary joining and corrections in the inlet side and the exhaust side.
● Change your model to represent the following engine details
o No of cylinders: 4
o Ignition type: Manifold injection (petrol-use indolene)
o Inlet straight 100 mm long, 48 mm reducing to 43 mm.
o Bend at inlet manifold 80 mm long along centre line determine the appropriate diameter of this.
o Exhaust straight 130 mm long, 42 mm expanding to 50 mm
o Bend at exhaust manifold 90 mm long along centre line with a 32 mm diameter
o Inlet temperature 303 K and pressure 1 bar
o Draw a representative diagram and include in the report (part b)
● Make reasonable assumptions for the rest of the conditions (this is something that you will have to accustom to in an industry situation.)
● Run simulations and obtain pressure, temperature and mass flow rate plots at key points.
● Write a brief description of how simulation can help make important design decisions in engine development.
● Describe your simulation problem with an appropriate diagrams and parameters that are important to set up your model.
● Show the findings of the simulation with appropriate graphs and table giving brief statements of why the output you have produced is important. You are expected to compare your results against the in class tutorial output
● Make comments on the differences that you saw with your original model (the classroom problem) and identify any significant patterns that you see.
Due Date: TBC. The assignment is located in the ‘Assignments’ area of the course and will automatically become available to students. You are only required to produce a report in a maximum of FOUR A4 pages for this part, including figures.