O uticaju igle na nadzvučno strujanje oko zaobljenog tela
On the influence of spike shape at supersonic flow past blunt bodies
Apstrakt
Da bi se eliminsala pojava jakog udarnog talasa pri nadzvučnom opstrujavanju projektila, koja zanačajno povećava otpor pri letu krozvazduh, na njegov vrh montira se igla. U radu se daju rezultati eksperimentalnog istraživanja uticaja oblika igle na aerodinamičke koeficijente (uzgona, otpora, momenta propinjanja, kao i položaj centra pritiska) pri nadzvučnom opstrujavanju tela zaobljenog vrha. Eksperiment je izveden u aereotunelu, za jednu vrednost Mahovog i Rejnoldsovog broja, kao i za jednu vrednost napadnog ugla α = 2o. Za telo bez igle, kao i za telo sa četiri različita modela igle merene su aerodinamičke sile i momenti. U radu su predloženi kriterijumi za procenu uticaja igle zasnovani isključivo na rezultataima dobijrenim vizualizacijom strujanja. Igla najboljih karakteristika, od ispitanih konfiguracija, izabrana na osnovu izmerenih aerodinamičkih koeficijenata, uklapa se u ove kvalitativne kriterijume.
In order to eliminate the appearance of a strong shock wave at a supersonic flight of a missile, which considerably increases the drag during its flight through the air, a spike is mounted on its nose. Presented paper offers the results of an experimental analysis of the influence of the spike's shape on the aerodynamic coefficients (drag, lift and pitching moment coefficient, as well as the location of the center of pressure) at supersonic flow past blunt-nosed body. The experiment was carried out in a wind tunnel, for one value of Mach and Reynolds numbers, and for one value of the angles of attack, α = 2o. For the body without spike, and with four different spike shapes, the aerodynamic forces and moment were measured. Using only the photos obtained by Schlieren visualization of the flow, the paper proposes a criterion of estimating the aerodynamic effect of the spike shape. The best spike shape from the experimental set of spikes, selected by the measurement of the aerodynamic coef...ficients, coincided with this qualitative criterion.
Ključne reči:
supersonic flow / spiked body / shock wave / blunt-nosed body / angle of attack / aerodynamic coefficientsIzvor:
Facta universitatis - series: Mechanics, Automatic Control and Robotics, 2002, 3, 12, 371-382Izdavač:
- Univerzitet u Nišu, Niš
Kolekcije
Institucija/grupa
Mašinski fakultetTY - JOUR AU - Milićev, Snežana AU - Pavlović, Miloš D. AU - Ristić, Slavica AU - Vitić, Aleksandar PY - 2002 UR - https://machinery.mas.bg.ac.rs/handle/123456789/319 AB - Da bi se eliminsala pojava jakog udarnog talasa pri nadzvučnom opstrujavanju projektila, koja zanačajno povećava otpor pri letu krozvazduh, na njegov vrh montira se igla. U radu se daju rezultati eksperimentalnog istraživanja uticaja oblika igle na aerodinamičke koeficijente (uzgona, otpora, momenta propinjanja, kao i položaj centra pritiska) pri nadzvučnom opstrujavanju tela zaobljenog vrha. Eksperiment je izveden u aereotunelu, za jednu vrednost Mahovog i Rejnoldsovog broja, kao i za jednu vrednost napadnog ugla α = 2o. Za telo bez igle, kao i za telo sa četiri različita modela igle merene su aerodinamičke sile i momenti. U radu su predloženi kriterijumi za procenu uticaja igle zasnovani isključivo na rezultataima dobijrenim vizualizacijom strujanja. Igla najboljih karakteristika, od ispitanih konfiguracija, izabrana na osnovu izmerenih aerodinamičkih koeficijenata, uklapa se u ove kvalitativne kriterijume. AB - In order to eliminate the appearance of a strong shock wave at a supersonic flight of a missile, which considerably increases the drag during its flight through the air, a spike is mounted on its nose. Presented paper offers the results of an experimental analysis of the influence of the spike's shape on the aerodynamic coefficients (drag, lift and pitching moment coefficient, as well as the location of the center of pressure) at supersonic flow past blunt-nosed body. The experiment was carried out in a wind tunnel, for one value of Mach and Reynolds numbers, and for one value of the angles of attack, α = 2o. For the body without spike, and with four different spike shapes, the aerodynamic forces and moment were measured. Using only the photos obtained by Schlieren visualization of the flow, the paper proposes a criterion of estimating the aerodynamic effect of the spike shape. The best spike shape from the experimental set of spikes, selected by the measurement of the aerodynamic coefficients, coincided with this qualitative criterion. PB - Univerzitet u Nišu, Niš T2 - Facta universitatis - series: Mechanics, Automatic Control and Robotics T1 - O uticaju igle na nadzvučno strujanje oko zaobljenog tela T1 - On the influence of spike shape at supersonic flow past blunt bodies EP - 382 IS - 12 SP - 371 VL - 3 UR - https://hdl.handle.net/21.15107/rcub_machinery_319 ER -
@article{ author = "Milićev, Snežana and Pavlović, Miloš D. and Ristić, Slavica and Vitić, Aleksandar", year = "2002", abstract = "Da bi se eliminsala pojava jakog udarnog talasa pri nadzvučnom opstrujavanju projektila, koja zanačajno povećava otpor pri letu krozvazduh, na njegov vrh montira se igla. U radu se daju rezultati eksperimentalnog istraživanja uticaja oblika igle na aerodinamičke koeficijente (uzgona, otpora, momenta propinjanja, kao i položaj centra pritiska) pri nadzvučnom opstrujavanju tela zaobljenog vrha. Eksperiment je izveden u aereotunelu, za jednu vrednost Mahovog i Rejnoldsovog broja, kao i za jednu vrednost napadnog ugla α = 2o. Za telo bez igle, kao i za telo sa četiri različita modela igle merene su aerodinamičke sile i momenti. U radu su predloženi kriterijumi za procenu uticaja igle zasnovani isključivo na rezultataima dobijrenim vizualizacijom strujanja. Igla najboljih karakteristika, od ispitanih konfiguracija, izabrana na osnovu izmerenih aerodinamičkih koeficijenata, uklapa se u ove kvalitativne kriterijume., In order to eliminate the appearance of a strong shock wave at a supersonic flight of a missile, which considerably increases the drag during its flight through the air, a spike is mounted on its nose. Presented paper offers the results of an experimental analysis of the influence of the spike's shape on the aerodynamic coefficients (drag, lift and pitching moment coefficient, as well as the location of the center of pressure) at supersonic flow past blunt-nosed body. The experiment was carried out in a wind tunnel, for one value of Mach and Reynolds numbers, and for one value of the angles of attack, α = 2o. For the body without spike, and with four different spike shapes, the aerodynamic forces and moment were measured. Using only the photos obtained by Schlieren visualization of the flow, the paper proposes a criterion of estimating the aerodynamic effect of the spike shape. The best spike shape from the experimental set of spikes, selected by the measurement of the aerodynamic coefficients, coincided with this qualitative criterion.", publisher = "Univerzitet u Nišu, Niš", journal = "Facta universitatis - series: Mechanics, Automatic Control and Robotics", title = "O uticaju igle na nadzvučno strujanje oko zaobljenog tela, On the influence of spike shape at supersonic flow past blunt bodies", pages = "382-371", number = "12", volume = "3", url = "https://hdl.handle.net/21.15107/rcub_machinery_319" }
Milićev, S., Pavlović, M. D., Ristić, S.,& Vitić, A.. (2002). O uticaju igle na nadzvučno strujanje oko zaobljenog tela. in Facta universitatis - series: Mechanics, Automatic Control and Robotics Univerzitet u Nišu, Niš., 3(12), 371-382. https://hdl.handle.net/21.15107/rcub_machinery_319
Milićev S, Pavlović MD, Ristić S, Vitić A. O uticaju igle na nadzvučno strujanje oko zaobljenog tela. in Facta universitatis - series: Mechanics, Automatic Control and Robotics. 2002;3(12):371-382. https://hdl.handle.net/21.15107/rcub_machinery_319 .
Milićev, Snežana, Pavlović, Miloš D., Ristić, Slavica, Vitić, Aleksandar, "O uticaju igle na nadzvučno strujanje oko zaobljenog tela" in Facta universitatis - series: Mechanics, Automatic Control and Robotics, 3, no. 12 (2002):371-382, https://hdl.handle.net/21.15107/rcub_machinery_319 .