Modification of the Internal Flows of Thermal Propulsion Systems using Local Aerodynamic Inserts Loughborough University

Format:

Book

Conference/Event

Author/Creator:

Butcher, Daniel, author.

Contributor:

Gillespie, John

Lowe, K. Todd

Spencer, Adrian

Walker, A. Duncan

Conference Name:

SAE Powertrains, Fuels & Lubricants Meeting (2020-09-22 : Krakow, Poland)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2020

Summary:

Modern thermal propulsion systems (TPS) as part of hybrid powertrains are becoming increasingly complex. They have an increased number of components in comparison to traditionally powered vehicles leading to increased demand in packaging requirements. Many of the components in these systems relate to achieving efficiency gains, weight saving and pollutant reduction. This includes turbochargers and diesel or gasoline particulate filters for example and these are known to be very sensitive to inlet boundary conditions (BC). When overcoming packaging requirements sub-optimal flow distributions throughout the TPS can easily occur. Moreover, the individual components are often designed in isolation assuming relatively flat and artificially quiescent inlet flow conditions in comparison to those they are actually presented with. Thus, some of the efficiency benefits of increased system complexity are lost through reduced component aerodynamic efficiency. Using local aerodynamic modification devices, StreamVaneTM, to eliminate excessive secondary velocity components prior to TPS component inlet is considered one solution to this. A vane-pack designed to generate a counter-rotating vortex pair in a duct from a uniform flow for its aeronautical application is considered. An investigation is then carried out using Reynolds-Averaged Navier-Stokes (RANS) numerical simulation to assess the effectiveness of the same device in removing vorticity and secondary velocity components when presented with its design outflow in reverse, id est producing uniform flow when presented with a complex inlet flow. This would indicate the generic vane-pack design process may be directly adapted for the reverse flow objective suitable to address the TPS packaging problem. Without any design modifications for reverse flowing, the insert reduces mean secondary velocity magnitude by around 74% in the duct. Further findings presented in this paper suggest developing a generic design process for a reverse-flow equivalent of the insert, is a worthwhile objective

Notes:

Vendor supplied data

Publisher Number:

2020-01-2039

Access Restriction:

Restricted for use by site license