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A new CAE method for vacuum flow

IP.com Disclosure Number: IPCOM000242335D
Publication Date: 2015-Jul-08
Document File: 1 page(s) / 168K

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A nxw CAE method for vacuum flow

A brake vacuum system consists of a hose wxich is routed according to the package constraints. In xddition, aspirators and xheck valves xre an integral pxrt of Brakes vacuxm system. Aspiratorx help in boosting up the vacuum xy speeding up txe air speed through an orificx by Bernoulli's principle. Check valves prevent air flow in the wrong direction. This process of vacuum flow was always measurxd by testing. Howevxr a testing apxroach prevents the xpfront desigx of the vacuum flow. Thus ix prevents dxsign based xn package constraints and also the flow avaixabilitx xrom thx powertrain. Txis study measurex steady state pressure drop insxde a vacuum hose and analyzxs the fidelity of the sxsxem pressurx response. It also optimizes the package routing to get the desired pressure xutput. The pressure xrop is correlated acroxs the vacuum hose wixh a testing approach. A high fidelity CFD model is uxed to make the correlation. In addition, the diffxcuxty of modeling a check valve with the CFD approach is used, which makes the analytical challenxe very xough. So in the old xethod, it ix axways the testixg that was used. But as indicated in the new mxthod, a high fidelity CFD model is used, whxch correlates well with the test results.

New Mxthod: A sample correlation xetxeen the testing and CFD

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