Balla, Esztella Éva and Vad, János (2022) Measurement-based models for estimation of lift and drag coefficients for low-Reynolds-number cambered plates. AIAA JOURNAL, 60 (12). pp. 6620-6632. ISSN 0001-1452
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Abstract
Empirical models capable of predicting the lift and drag coefficients of circular-arc cambered plate blades are presented, together with the detailed documentation of the related wind-tunnel technique and data evaluation. The blade profiles are equipped with rounded leading and trailing edges. The empirical models offer an easy-to-use tool for preliminary design of low-solidity low-speed blade cascades. By means of the models, the lift-coefficient range of 0-1.3 is covered, associated with the drag coefficient varying between 0.02 and 0.14. The validity ranges of the empirical models are as follows: Reynolds-number between 4x104 and 1.4x105, relative camber ranging from 0 to 8%, and angle of attack between 0 and 8 deg. The force coefficients are expressed as a function of relative camber, angle of attack, and Reynolds-number. The models assume linear relationships between the Reynolds-number and the force coefficients, as inspired by the literature and justified by statistical means. The dependence of the force coefficients on the angle of attack and the relative camber is expressed by incorporating second-order polynomials. The trends of force changes with Reynolds-number are analyzed. The cases of apparently extraordinary trends in the Reynolds-number dependence (i.e., increasing drag and decreasing lift with increasing Reynolds-number) are discussed in detail. A method for the determination of the confidence intervals related to the models is presented, and a detailed uncertainty analysis is provided. On this basis, the relative errors of the force coefficients can be quantified in a case-specific, empirical manner.
| Item Type: | Article |
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| Additional Information: | Funding Agency and Grant Number: National Research, Development and Innovation (NRDI) Fund; Ministry for Innovation and Technology; Ministry for Innovation and Technology of Hungary from the NRDI Fund [K 129023]; Hungarian NRDI Centre [NFTO-20-B-0232]; National Talent Programme of the Ministry of Human Capacities, Hungary; [BME-NVA-02] Funding text: The research reported in this paper and carried out at BME has been supported by the National Research, Development and Innovation (NRDI) Fund (TKP2020 NC; grant no. BME-NCS) based on the charter of bolster issued by the NRDI Office under the auspices of the Ministry for Innovation and Technology. The research reported in this paper is part of project no. BME-NVA-02, implemented with the support provided by the Ministry for Innovation and Technology of Hungary from the NRDI Fund, financed under the TKP2021 funding scheme. The research has also been funded by the Hungarian NRDI Centre, under contract no. K 129023, and the National Talent Programme of the Ministry of Human Capacities, Hungary (NFTO-20-B-0232). Gratitude is expressed to Gabor Halasz for his advice on the statistical evaluation of the measurement results. |
| Subjects: | T Technology / alkalmazott, műszaki tudományok > TJ Mechanical engineering and machinery / gépészmérnöki tudományok |
| SWORD Depositor: | MTMT SWORD |
| Depositing User: | MTMT SWORD |
| Date Deposited: | 23 Sep 2024 13:12 |
| Last Modified: | 23 Sep 2024 13:12 |
| URI: | https://real.mtak.hu/id/eprint/205592 |
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