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An investigation of the internal and external aerodynamics of cattle trucksWind tunnel tests were conducted on a one-tenth scale model of a conventional tractor trailer livestock hauler to determine the air flow through the trailer and the drag of the vehicle. These tests were conducted with the trailer empty and with a full load of simulated cattle. Additionally, the drag was determined for six configurations, of which details for three are documented herein. These are: (1) conventional livestock trailer empty, (2) conventional trailer with smooth sides (i.e., without ventilation openings), and (3) a stream line tractor with modified livestock trailer (cab streamlining and gap fairing). The internal flow of the streamlined modification with simulated cattle was determined with two different ducting systems: a ram air inlet over the cab and NACA submerged inlets between the cab and trailer. The air flow within the conventional trailer was random and variable. The streamline vehicle with ram air inlet provided a nearly uniform air flow which could be controlled. The streamline vehicle with NACA submerged inlets provided better flow conditions than the conventional livestock trailer but not as uniform or controllable as the ram inlet configuration.
Document ID
19830018489
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Muirhead, V. U. (Kansas Univ. Center for Research, Inc. Lawrence, KS, United States)
Date Acquired
September 4, 2013
Publication Date
May 1, 1983
Subject Category
Urban Technology And Transportation
Report/Patent Number
NASA-CR-170400
NAS 1.26:170400
KU-FRL-541-2
Accession Number
83N26760
Funding Number(s)
CONTRACT_GRANT: NAG4-8
PROJECT: RTOP 141-20-11
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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