Abstract
In this paper we describe, for the first time, a new method of two-point correlation estimations of turbulent flows using a laser Doppler velocity profile sensor. For the spatial correlation estimations the laser Doppler velocity profile sensor offers unique opportunities since a high spatial resolution of approximately 20 micron within the measurement volume is achieved. Furthermore, the low relative velocity measurement uncertainty of about 0.1% yields a high resolution of small velocity fluctuations and, therefore, allows correlation investigations where such high resolution is required. Moreover, a new virtual detection volume technique is presented which is only applicable in conjunction with the laser Doppler velocity profile sensor and offers the potential to achieve highly precise spatial correlation estimations. Measurements have been carried out in the turbulent wake of a circular. Both temporal as well as spatial correlation estimations have been calculated from the acquired velocity data yielding a longitudinal Taylor microscale of 3.53 mm and a transverse Taylor microscale of 1.84 mm.
| Original language | English |
|---|---|
| Pages (from-to) | 252-263 |
| Number of pages | 12 |
| Journal | Flow Measurement and Instrumentation |
| Volume | 20 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2009 Dec |
| Externally published | Yes |
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Keywords
- Laser Doppler velocity profile sensor
- Spatio-temporal correlation
- Taylor microscale
- Temporal correlation
- Two-point correlation
ASJC Scopus subject areas
- Instrumentation
- Modelling and Simulation
- Computer Science Applications
- Electrical and Electronic Engineering
Cite this
Two-point correlation estimation of turbulent shear flows using a novel laser Doppler velocity profile sensor. / Neumann, M.; Shirai, Katsuaki; Büttner, L.; Czarske, J.
In: Flow Measurement and Instrumentation, Vol. 20, No. 6, 12.2009, p. 252-263.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Two-point correlation estimation of turbulent shear flows using a novel laser Doppler velocity profile sensor
AU - Neumann, M.
AU - Shirai, Katsuaki
AU - Büttner, L.
AU - Czarske, J.
PY - 2009/12
Y1 - 2009/12
N2 - In this paper we describe, for the first time, a new method of two-point correlation estimations of turbulent flows using a laser Doppler velocity profile sensor. For the spatial correlation estimations the laser Doppler velocity profile sensor offers unique opportunities since a high spatial resolution of approximately 20 micron within the measurement volume is achieved. Furthermore, the low relative velocity measurement uncertainty of about 0.1% yields a high resolution of small velocity fluctuations and, therefore, allows correlation investigations where such high resolution is required. Moreover, a new virtual detection volume technique is presented which is only applicable in conjunction with the laser Doppler velocity profile sensor and offers the potential to achieve highly precise spatial correlation estimations. Measurements have been carried out in the turbulent wake of a circular. Both temporal as well as spatial correlation estimations have been calculated from the acquired velocity data yielding a longitudinal Taylor microscale of 3.53 mm and a transverse Taylor microscale of 1.84 mm.
AB - In this paper we describe, for the first time, a new method of two-point correlation estimations of turbulent flows using a laser Doppler velocity profile sensor. For the spatial correlation estimations the laser Doppler velocity profile sensor offers unique opportunities since a high spatial resolution of approximately 20 micron within the measurement volume is achieved. Furthermore, the low relative velocity measurement uncertainty of about 0.1% yields a high resolution of small velocity fluctuations and, therefore, allows correlation investigations where such high resolution is required. Moreover, a new virtual detection volume technique is presented which is only applicable in conjunction with the laser Doppler velocity profile sensor and offers the potential to achieve highly precise spatial correlation estimations. Measurements have been carried out in the turbulent wake of a circular. Both temporal as well as spatial correlation estimations have been calculated from the acquired velocity data yielding a longitudinal Taylor microscale of 3.53 mm and a transverse Taylor microscale of 1.84 mm.
KW - Laser Doppler velocity profile sensor
KW - Spatio-temporal correlation
KW - Taylor microscale
KW - Temporal correlation
KW - Two-point correlation
UR - http://www.scopus.com/inward/record.url?scp=70350417626&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=70350417626&partnerID=8YFLogxK
U2 - 10.1016/j.flowmeasinst.2009.09.001
DO - 10.1016/j.flowmeasinst.2009.09.001
M3 - Article
AN - SCOPUS:70350417626
VL - 20
SP - 252
EP - 263
JO - Flow Measurement and Instrumentation
JF - Flow Measurement and Instrumentation
SN - 0955-5986
IS - 6
ER -