Sökning: WFRF:(Zang Y) > (2020-2024) > Short-time proper o...
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000 | 04113naa a2200433 4500 | |
001 | oai:DiVA.org:kth-289064 | |
003 | SwePub | |
008 | 210127s2020 | |||||||||||000 ||eng| | |
024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2890642 URI |
024 | 7 | a https://doi.org/10.1016/j.ast.2020.1062762 DOI |
040 | a (SwePub)kth | |
041 | a engb eng | |
042 | 9 SwePub | |
072 | 7 | a ref2 swepub-contenttype |
072 | 7 | a art2 swepub-publicationtype |
100 | 1 | a Lim, H. D.u Nanyang Technol Univ, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore.4 aut |
245 | 1 0 | a Short-time proper orthogonal decomposition of time-resolved schlieren images for transient jet screech characterization |
264 | 1 | b Elsevier BV,c 2020 |
338 | a print2 rdacarrier | |
500 | a QC 20210127 | |
520 | a Short-time Proper Orthogonal Decomposition (POD) is proposed as an image-based technique to study the transient jet screech characteristics of moderately under-expanded supersonic jets emanating from a circular baseline and two bevelled nozzles. Time-resolved schlieren imaging of turbulent flow structures were performed with an ultrahigh-speed schlieren setup. Short-time POD was performed by systematically sampling image-series with a short time delay, performing PODs and applying spectral analyses on the first POD mode coefficients, and plotting the peak frequencies from the resulting PSDs into a peak frequency-occurrence count histogram. The results are in good agreement with the near-field noise spectra and wavelet transform analysis of the microphone measurements, which revealed intermittent jet screech occurrences at St=0.25 for both baseline and 30 degrees bevelled jets, while none was detected for the 60 degrees bevelled jet. In particular, the occurrence counts of the frequency bins is proposed as a suitable parameter to characterize the intermittent nature of jet screech, with the frequency bin revealing the jet screech frequency if present. The present study demonstrates the advantage of short-time POD analysis on time-resolved schlieren images over traditional image-based POD methods, which includes computational gains from parallelization, the ability to handle much larger datasets and revealing insights into a transient flow and noise phenomenon. | |
650 | 7 | a TEKNIK OCH TEKNOLOGIERx Maskinteknikx Strömningsmekanik och akustik0 (SwePub)203062 hsv//swe |
650 | 7 | a ENGINEERING AND TECHNOLOGYx Mechanical Engineeringx Fluid Mechanics and Acoustics0 (SwePub)203062 hsv//eng |
653 | a Flow diagnostics | |
653 | a Schlieren | |
653 | a Aeroacoustics | |
653 | a Jet screech | |
653 | a Supersonic jets | |
653 | a Proper orthogonal decomposition | |
700 | 1 | a Wei, X. F.u Nanyang Technol Univ, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore.4 aut |
700 | 1 | a Zang, B.u Nanyang Technol Univ, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore.;Univ Bristol, Dept Aerosp Engn, Queens Bldg,Univ Walk, Bristol BS8 1TR, Avon, England.4 aut |
700 | 1 | a Vevek, U. S.u Nanyang Technol Univ, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore.4 aut |
700 | 1 | a Mariani, Raffaello,c Assistant Prof.d 1981-u Nanyang Technol Univ, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore4 aut0 (Swepub:kth)u18c6alu |
700 | 1 | a New, T. H.u Nanyang Technol Univ, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore.4 aut |
700 | 1 | a Cui, Y. D.u Natl Univ Singapore, Temasek Labs, 5A Engn Dr 1, Singapore 117411, Singapore.4 aut |
710 | 2 | a Nanyang Technol Univ, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore.b Nanyang Technol Univ, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore.;Univ Bristol, Dept Aerosp Engn, Queens Bldg,Univ Walk, Bristol BS8 1TR, Avon, England.4 org |
773 | 0 | t Aerospace Science and Technologyd : Elsevier BVg 107q 107x 1270-9638x 1626-3219 |
856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289064 |
856 | 4 8 | u https://doi.org/10.1016/j.ast.2020.106276 |
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