Search Results

A new method for reducing aerodynamic drag of trucks and vans has been developed. It uses Deturbulator tape to transform separated turbulent wakes into stagnant virtually solid streamlining extensions attached to the vehicle. Constrained mode flow-induced surface oscillations of the 100-μm thick, passive, flexible-surface Deturbulator tape attenuates turbulent mixing by driving the turbulence to a pre-selected high frequency in the dissipation range. Wind tunnel tests indicated 80% drag reduction. Road tests on a minivan and pickup truck showed 15-20% increased highway fuel economy due to reduced drag. 6% reduction in overall fuel consumption was obtained for an operational Class-8tractor-semitrailer.

A new method for streamlining tractor-trailer trucks based on weakening turbulent vortices in regions of separated flow using a flexible surface Deturbulator tape patented by the author. Minimal Deturbulator application on the tractor-cab sides yielded 4% improved fuel mileage by de-energizing recirculating vortices in the tractor-trailer gap. The entire trailer, especially flatbeds with loads can be encapsulated within a quiescent separated bubble by extending Deturbulator application to the tractor. It makes the truck appear more streamlined to the airflow evidenced by 13-30% fuel economy improvement. The Deturbulator configured as a replaceable strip provides a cost effective fuel savings add-on for already streamlined class-8 tractors, which does not impede normal operations..

An economical method for reliably determining fleet fuel savings that arises out of the application of a vehicle fuel saving measure is presented. The method relies on testing the device on a random sample of vehicles during normal fleet operations. The sample size is determined by variations in fuel economy inherent in the fleet and the minimum increase in fuel economy needed for a desired return on investment in the device. This reduces the probability that the sample is biased. The sample fuel economy is compared to that of an untreated control group of trucks which can be the rest of the fleet or a subset with certain characteristics, like similar idling percentage. The final results provide a range of fuel economy enhancements at a given confidence level. The method has been applied to validate in operation fuel economy increase of a flatbed tractor trailer fleet due to Sinhatech's Deturbulator aero-drag reducing device.