Abstract: An exhaust mixer assembly having a twisted mixer and an open centerbody is provided. The open centerbody is centrally disposed within the twisted mixer and helps to provide efficient cooling of exhaust air from gas turbine engines. A method for cooling exhaust air from a gas turbine engine using the exhaust mixer assembly of the invention is also provided.

Abstract: An industrial process oxygen analyzer, and method of using same, incorporates an automotive oxygen sensor to minimize the criticalness of controlling heater temperature during operation. Higher sensor heater temperature, required to accommodate the automotive oxygen sensor, is achieved by application of higher supply voltage to the sensor heater. Current limiting of the heater supply circuit reduces stress on the sensor heater, even at the higher operating temperature.

Abstract: An elongate exhaust gas muffler for a turbine engine includes a foraminous central exhaust duct which is circumscribed along its length by a plurality of tuned dissipative and reactive noise attenuation chambers. At an inlet end of the muffler an annular secondary flow inlet is defined about the central exhaust duct and opens to the first sound attenuation chamber. A secondary flow of pressurized bleed air is receivable into the first attentuation treatment in the muffler.

Abstract: An industrial process oxygen analyzer, and method of using same, incorporates an automotive oxygen sensor to minimize the criticalness of controlling heater temperature during operation. Higher sensor heater temperature, required to accommodate the automotive oxygen sensor, is achieved by application of higher supply voltage to the sensor heater. Current limiting of the heater supply circuit reduces stress on the sensor heater, even at the higher operating temperature.

Abstract: A compact turbine engine exhaust gas noise suppressor has a housing having a first chamber, a second chamber having an outlet and communicating with the first chamber through a transfer passage, and a third chamber communicating with the first chamber through a perforated dividing wall and having a resonant sound attenuator positioned therein. A sound absorbing member is positioned in the second chamber to create therein a serpentine flow path extending between the transfer passage and the outlet. The exhaust gas noise is attenuated by flowing the exhaust gas into the first chamber through a duct into which ambient cooling air is educted, and then forcing the exhaust gas outwardly through the serpentine flow path.

Abstract: A modified zirconia oxygen sensor is disclosed wherein gas flows through inner (14) and outer tubes (12) and wherein one electrode (18) is attached to the inner surface of the inner tube (14), and the second electrode (16) is attached to the outer surface of the inner tube (14). The outer catalytic surface of inner tube (14) is made inert so that an oxygen potential difference is produced between the electrodes (16, 18) which results in a voltage output, as read by the oxygen analyzer (42), which is proportional to the initial level of the combustible in the gas. The utilization of inner (14) and outer tubes (12) wherein the portion of the gas sample contacting the active electrode (18) is maintained separate from the portion of the gas sample contacting the inactive electrode (16) prevents back or edge diffusion between the electrodes.

Abstract: An axially asymmetric exhaust gas muffler has a perforated central exhaust duct that is circumscribed by a duality of reactive sound attenuating chambers in each of which is positioned a resonant sound attenuator.

Abstract: A gas sampling analyzing system is provided whereby flue or process gasses are aspirated from a process duct to an analyzer and are therefrom returned back to the process duct to prevent condensation at the system exhaust. The sampling analyzing system is enclosed in an internally heated manifold to prevent condensation of the sampled gas and insure an accurate analysis by the system. The sampling analyzing system has an analyzer assembly connected in parallel with a drop tube with the combination being connected to a sample probe on one side and to a supply air operated aspirator on the other side. The parallel drop tube allows a high flow rate to be maintained between the sample probe and the aspirator to ensure a faster system response to changes in concentrations of the flue or process gasses.