FUEL SUPPLY SYSTEM OF AIRCRAFT GAS TURBINE ENGINE AND FUEL SUPPLY METHOD

• Main Authors: SEKI NAOKI, SUGAWARA HIROTAKA
• Format: Patent
• Language: English; Japanese
• Published: 23.08.2022
• Subjects: AIR INTAKES FOR JET-PROPULSION PLANTS; BLASTING; COMBUSTION ENGINES; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS; GAS-TURBINE PLANTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; WEAPONS

To provide a fuel supply system which can accurately identify an internal leak model of a gear pump.SOLUTION: A fuel supply system comprises a gear pump 120, a measuring section 160 including an orifice 140 and a check valve 150 which are connected to each other in parallel at a downstream of the gear pump, a minimum pressurization check valve 170 disposed downstream of the measuring section, and a control device 180. The check valve 150 is closed when a gear pump rotation number is smaller than an upper threshold, and opened when the gear pump rotation number is equal to or larger than the upper threshold, and the minimum pressurization check valve 170 comprises a cylinder, and a piston for defining the inside of the cylinder to a first chamber communicating with a measuring-section outlet and a second chamber communicating with a system inlet. The piston is energized by a spring in a direction progressing toward the first chamber, and a flow-out port whose opening is adjusted by a reciprocation motion of the piston is arranged at a piston sidewall. The minimum pressurization check valve 170 is constituted so as to constantly maintain a pressure difference between the system inlet and the measuring-section outlet when the gear pump rotation number is equal to or larger than a lower threshold, and equal to or smaller than an intermediate threshold.SELECTED DRAWING: Figure 1 【課題】ギアポンプの内部リークモデルを高精度で同定できる燃料供給システムを提供する。【解決手段】ギアポンプ１２０と、その下流で互いに並列接続されたオリフィス１４０及び逆止弁１５０を含む計量セクション１６０と、その下流に配置された最低加圧逆止弁１７０と、制御装置１８０とを備え、逆止弁１５０は、ギアポンプ回転数が上方閾値未満の時に閉じ上方閾値以上の時に開き、最低加圧逆止弁１７０は、シリンダと、シリンダ内を計量セクション出口に連通する第１室とシステム入口に連通する第２室とに区画するピストンとを備え、ピストンは第１室へ向かう方向にバネ付勢されており、シリンダ側壁には、ピストンの往復移動により開度が調整される流出ポートが設けられており、最低加圧逆止弁１７０は、ギアポンプ回転数が下方閾値以上中間閾値以下の時に、システム入口と計量セクション出口との間の差圧を一定に維持するよう構成されている。【選択図】図１