Multipoint Pressure Strip Measurement for Advanced CFD Validation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F15%3A00242129" target="_blank" >RIV/68407700:21220/15:00242129 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Multipoint Pressure Strip Measurement for Advanced CFD Validation

Popis výsledku v původním jazyce

An innovative approach to pressure measurement in low-speed aerodynamics is introduced. Pressure strips are small flexible devices that measure pressure at 24 locations, providing the pressure distribution along a curve. The choice of absolute MEMS pressure sensors makes the strips both precise and inexpensive at the same time. The invasiveness of the pressure strips to the airflow, as well as the pressure reading error due to non-negligible dimensions of the devices, was investigated. Both effects can be eliminated by careful choice of placement on the aerodynamic body in road vehicle applications. The pressure strips are part of a measurement system that was developed by the Czech Technical University in Prague in cooperation with ŠKODA AUTO a.s. The philosophy of the system – ease of operation and low cost – is reflected in every step of the experimental workflow, from installation on the aerodynamic body, through coordinates identification and measurement user interface, to a comparison tool with computational results. The workflow has been perfected to the point where it is so rapid that it brings no notable delay to the preparation of cars for standard wind tunnel measurements. Examples of some experimental results are presented. A graphical representation of a CFD validation measurement with a total of 44 pressure strips (1056 sensors) is shown in Figure 8.12. The preparation for a pressure distribution measurement on the vehicle’s exterior in the symmetry plane took no more than 20 minutes; results are shown in Figure 8.11. Data analysis may generally be seen from two perspectives. The first perspective – CFD methodology validation – is fairly straightforward, where the pressure distributions establish a solid basis for simulation error hypothesis. Another perspective, rather statistical, is presented in which statistical analysis will be performed over a large group of data.

Název v anglickém jazyce

Multipoint Pressure Strip Measurement for Advanced CFD Validation

Popis výsledku anglicky

An innovative approach to pressure measurement in low-speed aerodynamics is introduced. Pressure strips are small flexible devices that measure pressure at 24 locations, providing the pressure distribution along a curve. The choice of absolute MEMS pressure sensors makes the strips both precise and inexpensive at the same time. The invasiveness of the pressure strips to the airflow, as well as the pressure reading error due to non-negligible dimensions of the devices, was investigated. Both effects can be eliminated by careful choice of placement on the aerodynamic body in road vehicle applications. The pressure strips are part of a measurement system that was developed by the Czech Technical University in Prague in cooperation with ŠKODA AUTO a.s. The philosophy of the system – ease of operation and low cost – is reflected in every step of the experimental workflow, from installation on the aerodynamic body, through coordinates identification and measurement user interface, to a comparison tool with computational results. The workflow has been perfected to the point where it is so rapid that it brings no notable delay to the preparation of cars for standard wind tunnel measurements. Examples of some experimental results are presented. A graphical representation of a CFD validation measurement with a total of 44 pressure strips (1056 sensors) is shown in Figure 8.12. The preparation for a pressure distribution measurement on the vehicle’s exterior in the symmetry plane took no more than 20 minutes; results are shown in Figure 8.11. Data analysis may generally be seen from two perspectives. The first perspective – CFD methodology validation – is fairly straightforward, where the pressure distributions establish a solid basis for simulation error hypothesis. Another perspective, rather statistical, is presented in which statistical analysis will be performed over a large group of data.

Druh

D - Stať ve sborníku

CEP obor

JU - Aeronautika, aerodynamika, letadla

OECD FORD obor

—

Projekt

—

Návaznosti

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Progress in Vehicle Aerodynamics and Thermal Management

ISBN

978-3-8169-3322-9

ISSN

—

e-ISSN

—

Počet stran výsledku

14

Strana od-do

87-100

Název nakladatele

FKFS Forschungsinstitut für Kraftfahrwesen und Fahrzeugmotoren Stuttgart

Místo vydání

Stuttgart

Místo konání akce

Stuttgart

Datum konání akce

29. 9. 2015

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—