COMPUTATIONAL STUDY OF AERODYNAMIC CHARACTERISTICS OF SINGLE-ROTOR HELICOPTER TAIL ROTOR UNDER THE INFLUENCE OF VORTICAL WAKE OF MAIN ROTOR AT THE HOVER WITH CROSSWIND
For single-rotor helicopters there are special flight modes, when tail rotor (TR) is under significant inductive influence of vortical wake of main rotor (MR). Inductive influence of vortical wake of MR can provoke essential changes in flowing of TR and its aerodynamic characteristics comparing to i...
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| Format: | Article |
| Language: | Russian |
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Moscow State Technical University of Civil Aviation
2017-01-01
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| Series: | Научный вестник МГТУ ГА |
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| Online Access: | https://avia.mstuca.ru/jour/article/view/986 |
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| author | Yu. M. Ignatkin P. V. Makeev A. I. Shomov V. A. Ivchin |
| author_facet | Yu. M. Ignatkin P. V. Makeev A. I. Shomov V. A. Ivchin |
| author_sort | Yu. M. Ignatkin |
| collection | DOAJ |
| description | For single-rotor helicopters there are special flight modes, when tail rotor (TR) is under significant inductive influence of vortical wake of main rotor (MR). Inductive influence of vortical wake of MR can provoke essential changes in flowing of TR and its aerodynamic characteristics comparing to isolated rotor. In this case increase of tail rotor pitch, necessary for helicopter controlling, is possible.The article contains computational modelling of TR work with vortical wake of MR at the example of MIL Mi-171 helicopter. The modelling has been made on the base of non-linear blade (free wake) vortical model of rotor, produced at Helicopter Design Department of MAI.Helicopter hovering modes with crosswind of various intensity Vz was considered. Thrust-time lationship forisolated TR and TR with vortical wake of MR for equal flight modes was obtained. Flow around the rotors was analyzed, its vortical wake was considered.The results make it possible to clarify the peculiarities of TR work on considered modes and MR influence on its work. It was found out that vortical wake of MR has a more significant impact on TR work with crosswind on the right, when TR falls into vortex ring state mode. Inductive influence of vortical wake of MR leads to vortexring state mode for TR on lower speeds (Vz :: 5 m/s) than in case of isolated work of TR (Vz :: 12,5 m/s). In that case,the required tail rotor pitch has increased by 13% for Vz = 5 m/s. The results of modelling and flight tests led to good agreement. |
| format | Article |
| id | doaj-art-7a7a9cbd53624381922e3dbe4a67e395 |
| institution | DOAJ |
| issn | 2079-0619 2542-0119 |
| language | Russian |
| publishDate | 2017-01-01 |
| publisher | Moscow State Technical University of Civil Aviation |
| record_format | Article |
| series | Научный вестник МГТУ ГА |
| spelling | doaj-art-7a7a9cbd53624381922e3dbe4a67e3952025-08-20T03:23:19ZrusMoscow State Technical University of Civil AviationНаучный вестник МГТУ ГА2079-06192542-01192017-01-011965867986COMPUTATIONAL STUDY OF AERODYNAMIC CHARACTERISTICS OF SINGLE-ROTOR HELICOPTER TAIL ROTOR UNDER THE INFLUENCE OF VORTICAL WAKE OF MAIN ROTOR AT THE HOVER WITH CROSSWINDYu. M. Ignatkin0P. V. Makeev1A. I. Shomov2V. A. Ivchin3Moscow Aviation Institute (National Research University)Moscow Aviation Institute (National Research University)Moscow Aviation Institute (National Research University)Mil Moscow Helicopter PlantFor single-rotor helicopters there are special flight modes, when tail rotor (TR) is under significant inductive influence of vortical wake of main rotor (MR). Inductive influence of vortical wake of MR can provoke essential changes in flowing of TR and its aerodynamic characteristics comparing to isolated rotor. In this case increase of tail rotor pitch, necessary for helicopter controlling, is possible.The article contains computational modelling of TR work with vortical wake of MR at the example of MIL Mi-171 helicopter. The modelling has been made on the base of non-linear blade (free wake) vortical model of rotor, produced at Helicopter Design Department of MAI.Helicopter hovering modes with crosswind of various intensity Vz was considered. Thrust-time lationship forisolated TR and TR with vortical wake of MR for equal flight modes was obtained. Flow around the rotors was analyzed, its vortical wake was considered.The results make it possible to clarify the peculiarities of TR work on considered modes and MR influence on its work. It was found out that vortical wake of MR has a more significant impact on TR work with crosswind on the right, when TR falls into vortex ring state mode. Inductive influence of vortical wake of MR leads to vortexring state mode for TR on lower speeds (Vz :: 5 m/s) than in case of isolated work of TR (Vz :: 12,5 m/s). In that case,the required tail rotor pitch has increased by 13% for Vz = 5 m/s. The results of modelling and flight tests led to good agreement.https://avia.mstuca.ru/jour/article/view/986helicoptermain rotortail rotorhover with crosswindaerodynamic interferenceaerodynamic characteristics |
| spellingShingle | Yu. M. Ignatkin P. V. Makeev A. I. Shomov V. A. Ivchin COMPUTATIONAL STUDY OF AERODYNAMIC CHARACTERISTICS OF SINGLE-ROTOR HELICOPTER TAIL ROTOR UNDER THE INFLUENCE OF VORTICAL WAKE OF MAIN ROTOR AT THE HOVER WITH CROSSWIND Научный вестник МГТУ ГА helicopter main rotor tail rotor hover with crosswind aerodynamic interference aerodynamic characteristics |
| title | COMPUTATIONAL STUDY OF AERODYNAMIC CHARACTERISTICS OF SINGLE-ROTOR HELICOPTER TAIL ROTOR UNDER THE INFLUENCE OF VORTICAL WAKE OF MAIN ROTOR AT THE HOVER WITH CROSSWIND |
| title_full | COMPUTATIONAL STUDY OF AERODYNAMIC CHARACTERISTICS OF SINGLE-ROTOR HELICOPTER TAIL ROTOR UNDER THE INFLUENCE OF VORTICAL WAKE OF MAIN ROTOR AT THE HOVER WITH CROSSWIND |
| title_fullStr | COMPUTATIONAL STUDY OF AERODYNAMIC CHARACTERISTICS OF SINGLE-ROTOR HELICOPTER TAIL ROTOR UNDER THE INFLUENCE OF VORTICAL WAKE OF MAIN ROTOR AT THE HOVER WITH CROSSWIND |
| title_full_unstemmed | COMPUTATIONAL STUDY OF AERODYNAMIC CHARACTERISTICS OF SINGLE-ROTOR HELICOPTER TAIL ROTOR UNDER THE INFLUENCE OF VORTICAL WAKE OF MAIN ROTOR AT THE HOVER WITH CROSSWIND |
| title_short | COMPUTATIONAL STUDY OF AERODYNAMIC CHARACTERISTICS OF SINGLE-ROTOR HELICOPTER TAIL ROTOR UNDER THE INFLUENCE OF VORTICAL WAKE OF MAIN ROTOR AT THE HOVER WITH CROSSWIND |
| title_sort | computational study of aerodynamic characteristics of single rotor helicopter tail rotor under the influence of vortical wake of main rotor at the hover with crosswind |
| topic | helicopter main rotor tail rotor hover with crosswind aerodynamic interference aerodynamic characteristics |
| url | https://avia.mstuca.ru/jour/article/view/986 |
| work_keys_str_mv | AT yumignatkin computationalstudyofaerodynamiccharacteristicsofsinglerotorhelicoptertailrotorundertheinfluenceofvorticalwakeofmainrotoratthehoverwithcrosswind AT pvmakeev computationalstudyofaerodynamiccharacteristicsofsinglerotorhelicoptertailrotorundertheinfluenceofvorticalwakeofmainrotoratthehoverwithcrosswind AT aishomov computationalstudyofaerodynamiccharacteristicsofsinglerotorhelicoptertailrotorundertheinfluenceofvorticalwakeofmainrotoratthehoverwithcrosswind AT vaivchin computationalstudyofaerodynamiccharacteristicsofsinglerotorhelicoptertailrotorundertheinfluenceofvorticalwakeofmainrotoratthehoverwithcrosswind |