ENGINEERING TRIPOS PART IIB – 2012/2013

Module 4A3 - Turbomachinery I

Leader:	Dr R. Miller (rjm76@eng.cam.ac.uk)
Timing:	Michaelmas Term
Prerequisites:	3A1 and 3A3 assumed
Structure:	12 lectures (including examples classes) + coursework
Assessment:	*Material / Format / Timing / Marks* Lecture syllabus / Written exam (1.5 hours) / Start of Easter term / 75% Coursework / Laboratory Report / 15 days after experiment / 25%

AIMS

This course aims to provide a general understanding of the principles that govern the design of axial flow and radial flow turbomachines.

LECTURE SYLLABUS

Applications and Characteristics of Turbomachines (12L, Dr N.R. Atkins and Prof. P. Tucker)

Stage design and choice of design parameters.
Specific speed, dynamic scaling and measures of efficiency.
Analysis of the mean-line flow in compressors and turbines.
Radial flow turbomachines.
Characteristics of compressors, pumps and turbines.
Matching of components: compressors and turbines; nozzles, throttles and diffusers. Compressor off-design problems; stall and its consequences.
Application of turbomachines: power plant and aircraft propulsion systems.

COURSEWORK

Turbine cascade test

Testing of a turbine cascade in a small wind tunnel to measure the blade surface pressure distribution, loss coefficient and flow exit angle.

Time required: About 3 hours in the lab plus 4 hours writeup.

OBJECTIVES

On completion of the module, students should:

Understand the principles underpinning the study of turbomachine aerodynamics;
Know the requirements for different type of turbomachines;
Know the factors which influence the overall design of turbomachine stages and which influence the matching of components;
Know the factors which influence overall design of turbomachines for propulsion and stationary power-plant applications;
Be able to evaluate the performance of turbine and compressor bladerows and stages using mean-line analyses;
Be able to select a design for a given duty;
Be able to present and understand information on stage and machine design;
Be able to describe and understand compressor off-design performance;
Be able to analyse the performance of propulsion systems and stationary power plant.

REFERENCES

Please see the Booklist for Group A Courses for references for this module.

Last updated: May 2012