| 摘要 |
685,068. Generating combustion products under pressure. SHELL REFINING & MARKETING CO., Ltd. Feb. 26, 1951 [March 21, 1950], No. 7072/50. Class 51 (i). In an air-jacketed type of combustion chamber for a gas turbine engine, the flame tube comprises a cylindrical portion 8 within which the burner 17 is disposed, and a tubular wall 9 of greater diameter than the portion 8, the wall 9 and portion 8 being connected by a divergent wall 10. A shroud 13 surrounds the burner to form an annular channel through which a substantial though minor portion of the combustion air is admitted, and an air swirler 12 is disposed around the shroud through which the remainder of the combustion air is admitted. The part of the tubular wall 9 which surrounds the flame 18 is substantially imperforate, but the portion downstream of the flame is provided with orifices 19-22 through which dilution or tertiary air is admitted. The shroud 13 is closed at its upstream end and has ports 14 in its wall for the admission of combustion air ; the downstream end is formed with a converging lip 15. The relative axial positions of the burner and shroud may be adjustable. The upstream rows of orifices 19, 20 are elongated and their longitudinal axes are inclined to the axis of the flame tube at the same angle as that which the current of gases inside the flame tube makes with the axis thereof. The upstream rows of dilution air orifices may alternatively be provided with chutes or with an obturator ring of U-shaped section disposed around the downstream edges of the orifices. A bleed tube may be disposed around the burner to permit a small flow of air around the tip of the burner to keep it clean. Combustion air may be admitted through the open upstream end of the sleeve 13 instead of through ports 14, and a disc-shaped baffle is then disposed upstream of the open end. Some or all of the dilution air orifices may have short pipes projecting radially or tangentially into the interior of the flame tube and the pipes may be double-walled. The orifices may also have trough-like baffles with their open sides facing upstream as in Specification 676,473.
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