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ENGINEERING TRIPOS PART IIB – 2012/2013

Module 4A11 - Turbomachinery II

Leader:	Dr L Xu
Timing:	Lent Term
Prerequisites:	3A1 and 3A3 are strongly recommended; 4A3 essential
Structure:	12 lectures + 4 work slots (including examples classes)
Assessment:	*Material / Format / Timing / Marks* Lecture Syllabus / Written exam (1.5 hours) / Start of Easter Term / 75 % Coursework / Report / 15 days after experiment / 25 %

AIMS

To provide a more thorough understanding of the two-dimensional and three-dimensional flow fields within axial-flow and radial-flow turbomachines. To provide an appreciation of current design methods and the parameters which determine the overall layout and design of turbomachines.

LECTURE SYLLABUS

Turbomachine aerodynamics and installations

(12L Dr L. Xu)

Blade-to-blade flow: boundary layer behaviour; diffusion factor; deviation; optimum pitch-chord ratio; special aspects of transonic and supersonic flow.
Axisymmetric through-flow: equations of motion on a meridional stream surface including the effects of streamline curvature and rotation; radial equilibrium equation including effects of blade radial force.
Numerical methods for turbomachinery: common calculation methods for blade-blade flows, hub-casing flows and 3-D flow fields.
Tip leakage and secondary flow in axial and radial flow turbomachines.

COURSEWORK

A computational exercise using standard numerical methods for turbomachinery design and analysis. To demonstrate blade-blade flows and hub-casing flows.

OBJECTIVES

On completion of the module students should:

Understand the principles underpinning the modelling of two and three-dimensional flows in turbomachines;
Understand the use of axisymmetric flow models in turbomachines;
Understand the types of flow calculation methods used in turbomachinery design;
Be able to analyse the blade-blade and hub-casing flow and evaluate the importance of the parameters which affect these flows;

REFERENCES

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

Last updated: June 2012

teaching-office@eng.cam.ac.uk