Premix combustor with flow constricting baffle between combustion and dilution zones

A combustion apparatus comprising, in combination, a housing providing a conduit for compressed air and a combustion liner in the housing, the liner being defined by wall means extending from an upstream end providing an inlet for combustion air to a downstream end providing an outlet for combustion products;

• the liner defining in flow sequence from the upstream to the downstream end a fuel introduction zone, a reaction zone, and a dilution zone in which the improvement comprises barrier means extending into the liner from the wall means providing a constricted passage between the reaction zone and the dilution zone;
• means providing continually open air entrance means between the said air conduit and the barrier means for entrance of cooling air into the barrier means;
• the barrier means defining distributed outlets for the cooling air from the barrier means into the interior of the liner;
• and baffle means within the barrier means effective to concentrate the cooling air flow adjacent the upstream and downstream faces of the barrier means.

A combustion apparatus comprising, in combination, a housing providing a conduit for compressed air and a combustion liner in the housing, the liner defined by wall means extending from an upstream end providing an inlet for combustion air to a downstream end providing an outlet for combustion products;

• the liner defining in flow sequence from the upstream to the downstream end a fuel introduction zone, a reaction zone, and a dilution zone;
• in which the improvement comprises barrier means extending into the liner from the wall means providing a constricted passage between the reaction zone and the dilution zone;
• air flow control means overlying the wall means at the barrier means and the dilution zone movable to control air flow from the conduit into the dilution zone, the control means providing continually open air entrance means between the said air conduit and the barrier means for entrance of cooling air into the barrier means;
• the barrier means defining distributed outlets for the cooling air from the barrier means into the interior of the liner.

A combustion apparatus comprising, in combination, a housing providing a conduit for compressed air and a combustion liner in the housing, the liner being defined by wall means extending from an upstream end providing an inlet for combustion air to a downstream end providing an outlet for combustion products;

• the liner defining in flow sequence from the upstream to the downstream end a fuel introduction zone, a reaction zone, and a dilution zone;
• in which the improvement comprises barrier means extending into the liner from the wall means providing a constricted passage between the reaction zone and the dilution zone;
• air flow control means overlying the wall means at the barrier means and the dilution zone movable to control air flow from the conduit into the dilution zone, the control means providing continually open air entrance means between the said air conduit and the barrier means for entrance of cooling air into the barrier means;
• the barrier means defining distributed outlets for the cooling air from the barrier means into the interior of the liner;
• and baffle means within the barrier means effective to concentrate the cooling air flow adjacent the upstream and downstream faces of the barrier means.