Abstract: A gas-liquid separator includes a main body including a bottom face portion and a tubular side wall, one end of the side wall being connected to the bottom face portion, the other end of the side wall including a first opening, a lid disposed so as to cover the first opening and including a gas inlet port and a gas outlet port, and a tubular separating wall disposed inside the side wall, one end of the separating wall being connected to the lid, the other end of the separating wall including a second opening. A gap is provided between the bottom face portion and an end portion on the side of the second opening of the separating wall, and the side wall includes a water outlet port provided at a location higher with respect to a vertical direction than the end portion on the side of the second opening.

Abstract: The invention is intended to suppress oscillatory combustion of a combustion apparatus. In the invention, acoustic closed ends are provided at an inlet side and an outlet side of the burner port unit, and the combustion apparatus is constituted so that the flame may be positioned between these closed ends, and a buffer chamber is provided at the inlet side. Thus, when the inlet side and outlet side of the burner port unit of the combustion apparatus are formed as acoustic closed ends, oscillatory combustion occurs easily. At this time, when the intake tube communicates at the upstream side of the inlet side closed end, and an exhaust tube communicates at the downstream side of the outlet side closed end, if the length of the intake tube and exhaust tube is changed, the air ratio and combustion amount for generating oscillatory combustion remain constant, and the oscillation frequency and oscillation pressure remain constant.