Gas Freeing Fan

The Problem

The driving force for the initiation of this project was significant competitor activity in the marketplace. The company concerned required a redesign of a 45 year old gas freeing fan which at that time had a very basic fan blade design at the heart of the unit. It was envisaged that CFD methods could drastically help to redesign the component to improve its performance and efficiency.

The Approach

For this problem the multiple rotating reference frames feature was taken advantage of, allowing a much faster steady state analysis of the problem. This enabled the simulation of a number of fan designs in the quickest time possible. Fan blade designs based on the original design and fan blades based on new designs were tested.

The Result

It was found that a massive 84% gain in flowrate was achievable with a particular new fan blade design. At this stage the company decided to validate the design and set about manufacturing the component using rapid prototype methods. Assembly and test work revealed that the CFD exercise provided an accurate (within 2%) prediction of the actual performance of the new fan. The time spent justified the performance increase and the component was adopted into full production and can be found in all of the company’s gas freeing fans today.