Drained fluid evacuation stub for a propulsion assembly

Patent metadata

Field	Value
Publication number	US-2016376931-A1
Application number	US-201415039003-A
Country	US
Kind code	A1
Filing date	Nov 25, 2014
Priority date	Dec 4, 2013
Publication date	Dec 29, 2016
Grant date	—

Abstract

Drained fluid evacuation stub ( 16 ) for a propulsion assembly ( 10 ), comprising a drained fluid storage cavity and at least one orifice ( 32 ) for evacuation of the fluids contained in said cavity, characterized in that it comprises means ( 36, 38 ) for detecting a pressure difference with the exterior of the stub and a component for purging the cavity which is movable between a first closed position of the evacuation orifice and a second release position of the orifice, the component being configured to move from the first to the second position when the pressure difference is greater than or equal to a predetermined value.

First claim

1 . Stub for discharging drained fluids for a propulsion unit, this stub comprising a cavity for storing the drained fluids and at least one orifice for discharging the fluids contained in the storage cavity, wherein it comprises means for measuring a difference in pressure outside the stub and a member for draining the storage cavity, this member being able to move between a first position of closing the discharge orifice and a second position of releasing this orifice, the member being configured so as to move from the first to the second position when said difference in pressure is greater than, or equal to, a predetermined value.

2 . Stub according to claim 1 , wherein it comprises a first means for measuring the total pressure outside the stub and a second means for measuring the static or pseudo-static pressure outside the stub.

3 . Stub according to claim 2 , wherein the member is able to move in translation in a recess in the stub and comprises or carries a transverse element separating two chambers inside the recess, a first chamber being connected to the first measuring means and a second chamber being connected to the second measuring means.

4 . Stub according to claim 3 , wherein the first measuring means is connected to one of the chambers by a duct comprising two parts, one of which is inclined or perpendicular with respect to the other.

5 . Stub according to claim 1 , wherein it has an aerodynamic profile such as an NACA profile of the biconvex symmetrical type.

6 . Stub according to claim 5 , wherein the stub comprises a first means for measuring the total pressure outside the stub and a second means for measuring the static or pseudo-static pressure outside the stub, and the first measuring means is situated on a leading edge of the profile and the second measuring means is situated on a side of the profile.

7 . Stub according to claim 6 , wherein the second measuring means is situated in a region of the profile where the pressure coefficient Cp has a substantially maximum value.

8 . Propulsion unit, wherein it comprises a stub according to claim 1 .

9 . Propulsion unit -according to claim 8 , wherein the stub has a substantially radial orientation with respect to the longitudinal axis of the propulsion unit and at least partly projects on an external surface of the nacelle of the propulsion unit, the measuring means being situated in the vicinity of the radially external end of the stub.

10 . Method for designing a stub according to claim 1 , wherein it comprises the steps:
determining an aerodynamic profile of the stub, such as an NACA profile of the biconvex symmetrical type, positioning a first means for measuring a maximum pressure on the leading edge of the profile, determining by calculation the distribution of the pressure coefficient Cp along the profile and deducing therefrom the region of the profile where this coefficient has a substantially maximum value, and positioning a second means for measuring a minimum pressure in said region.

Assignees

• Snecma

Inventors

• Leon Alexandre
• Pavillet Julien
• Sayn-Urpar Julien

Classifications

• F02C7/30

  Preventing corrosion {or unwanted deposits} in gas-swept spaces · CPC title

• B64D29/00 Primary

  Power-plant nacelles, fairings or cowlings · CPC title

• F05D2220/323

  for aircraft propulsion, e.g. jet engines · CPC title

• G01L7/00

  Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements ({G01L11/004 takes precedence;} transmitting or indicating the displacement of mechanical pressure-sensitive elements by electric {, e.g., photoelectric} or magnetic means G01L9/00; measuring differences of two or more pressure values G01L13/00; measuring two or more pressure values simultaneously G01L15/00) · CPC title

• F01D25/32 Primary

  Collecting of condensation water; Drainage {; Removing solid particles} · CPC title