PROBLEM DESCRIPTION

The DishDrawerTM is a unique product that incorporates two dishwashers into the same space as one standard dishwasher

This project aimed to increase the vertical space available in the DishDrawer™ by reducing the height of the pump impeller, whilst

maintaining or improving operating performance and efficiency

COMPUTATIONAL FLUID DYNAMICS (CFD)

CFD was used to gain an understanding of fluid behaviour. CFD

provides information such as velocity and pressure at any location,

whereas empirical testing can only provide this at sensor locations

The flow was analysed using a steady state, moving reference

frame model (MRF), to develop an understanding of how the

pump operates. A shortened and improved impeller was then

designed, simulated and prototyped from these results

PHYSICAL TESTING

Redesign was guided by empirical testing of impeller designs, high

speed imagery footage, CFD and Euler Turbomachinery equations

The improved impeller reduces the overall height by 5mm ( 20% )

maintaining the same pressure and flowrate

A high speed camera was used to visualize the internal flow and swirl

behavior. This was tracked with 400µm piolite particles filmed at

6000 FPS in a custom designed and built testing rig

Empirical testing of the impellers was performed to provide real-

world reference data that the CFD model was validated against

A test rig was designed and used to measure the generated pressure

and flowrate for a range of impeller designs

Pressure & Flowrate Testing Rig

High Speed Flow Pattern Snapshots

Thanks To

UC Team

Xavier Sander Callum Kennedy

Liam Barker Stasys Kulvis

Fisher and Paykel

Wayne Mason Stephen Kim

Rob Lawrence Sophie McCarroll

UC Staff

Dr. Mark Jermy

Mechanical Engineering Technicians

Impeller Prototype Comparison

Velocity Vectors Static Pressure Contours

DISHDRAWER™ WASH PUMP IMPELLER REDESIGN Project M10

Velocity Streamlines

High Speed Imagery Rig