摘要:
A system includes plural airfoils 302 operably coupled with a rotatable member 222 of an aircraft engine system 102. The rotatable member 222 is configured to rotate about an axial centerline 314 of the aircraft engine system 102. The system comprises a feature 342 at one or more exterior locations of an aircraft body 13. The feature 342 is shaped to alter a flow of air between the aircraft body 13 and the airfoils 302. Altering the flow of air also one or more of reduces a local load on the airfoils 302, reduces a local angle of attack 804 of the airfoils 302, or reduces a noise level that is generated by the aircraft engine system 102 as the rotatable member 222 rotates about the axial centerline 314 of the aircraft engine system 102 relative to the aircraft body 13 not including the feature 342.
摘要:
Apparatus and method are provided for reducing acoustical noise when cooling a device, such as a lamp system. The apparatus includes at least a set of a first synthetic jet and a second synthetic jet. The first and second synthetic jets are responsive to respective actuating signals having a phase difference (e.g., 180°) between one another chosen to reduce acoustic noise produced by the first and second synthetic jets when cooling the device.
摘要:
A turbomachine includes an annular casing and a fan disposed inside the annular casing and mounted for rotation about an axial centerline. The fan includes fan blades that extend radially outwardly toward the annular casing. The fan has an average chord fan width according to a first performance factor. The fan has a quantity of fan blades according to a second performance factor.
摘要:
A turbomachine includes an annular casing and a fan disposed inside the annular casing and mounted for rotation about an axial centerline. The fan includes fan blades that extend radially outwardly toward the annular casing. The fan has an average chord fan width according to a first performance factor. The fan has a quantity of fan blades according to a second performance factor.
摘要:
A turboprop engine (110) includes a main nacelle body (212), a rotatable hub (220) provided on the main nacelle body (212), a plurality of propellers (215, 520) connected to the rotatable hub (220), and a nacelle extension (214) coupled to the main nacelle body (212), the nacelle extension (214) including at least one wall (240) defining an air intake inlet (245, 510). The air intake inlet (245, 510) is movable in an airflow axis with respect to a trailing edge (216, 521) of a propeller (215, 520) in the plurality of propellers (215, 520) to vary a distance between the air intake inlet (245, 510) and the trailing edge (216, 521) of the propeller (215, 520) during various phases of operation of the turboprop engine (110).
摘要:
A turbomachine for an aircraft is provided. The turbomachine includes a plurality of radially-extending blades and an annular endwall opposite the radially-extending blades. The endwall includes an endwall treatment recessed into the endwall. The endwall treatment is characterized by a casing treatment volume compressibility factor (CTVCF), and a casing treatment normalized volume (CTNV), and a blade tip Mach number (Mtip).