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公开(公告)号：US10781827B1
公开(公告)日：2020-09-22
申请号：US15872171
申请日：2018-01-16
Applicant: UNITED TECHNOLOGIES CORPORATION
Inventor： Jason Elliott , Daniel C. Falk , Myron L. Klein , Ethan C. Drew , James H. Moffitt , Darryl Whitlow , Byron R. Monzon , Jay Thomas Abraham , William R. Graves
Abstract: A turbomachine airfoil element includes an airfoil that has pressure and suction sides spaced apart from one another in a thickness direction and joined to one another at leading and trailing edges. The airfoil extends in a radial direction a span that is in a range of 27.5-28.5 inches (699-724 mm). A chord length extends in a chordwise direction from the leading edge to the trailing edge at 50% span and is in a range of 13.0-14.0 inches (330-356 mm). The airfoil element includes at least two of a first mode with a frequency of 34±10% Hz, a second mode with a frequency of 90±10% Hz, a third mode with a frequency of 178±10% Hz, a fourth mode with a frequency of 222±10% Hz, a fifth mode with a frequency of 307±10% Hz and a sixth mode with a frequency of 389±10% Hz.
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公开(公告)号：US10711623B1
公开(公告)日：2020-07-14
申请号：US15872196
申请日：2018-01-16
Applicant: UNITED TECHNOLOGIES CORPORATION
Inventor： Jason Elliott , Daniel C. Falk , Myron L. Klein
Abstract: In one exemplary embodiment, a turbofan engine comprises a fan section. A core section includes a turbine section arranged fluidly downstream from the compressor section. A combustor is arranged fluidly between the compressor and turbine sections. The fan and core sections are configured to produce a thrust in a range 27,000-35,000 pounds-f (120,102-156,688 N). An airfoil is arranged in the fan section. The airfoil has first and second modes each having a frequency. The first mode has the lowest frequency, and the second mode has the second lowest frequency wherein the second mode frequency is 140 Hz or less at a redline engine speed.
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