Hot combustion gases, modeled as air behaving as an ideal gas, enter a turbine at 145 lbf/in.², 2700°R with a mass flow rate of 0.72 lb/s and exit at 29 lbf/in.² and 1620°R. If heat transfer from the turbine to its surroundings occurs at a rate of 45.82 Btu/s, determine the power output of the turbine, in hp. W cv = CV i hp
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- Q2: A compounded impulse turbine has two rows of moving blades separated by a fixed row of blades. The steam leaves the nozzle at an angle of 20° with the direction of motion of blades. The blades exit angles are 1st moving 30°, fixed 22° and 2nd moving 30 If the adiabatic heat drop of nozzle is 186.2 kJ/kg with nozzle efficiency of 90%, calculate the blade velocity necessary, if the final velocity of steam is to be axial. Assume a loss 15% in the relative velocity of all blade passages. Also obtain the blade efficiency. Draw the velocity diagram on scale. ting oro 250 ond of digohorging 03. A . In a renction turhin e the ongles of receiuir3. The motor unit A is used to elevate the 30o-kg cylinder at a constant rate of 2 m/s. If the power meter B registers an electrical input of 2.20 kw, calculate the combined electrical and mechanical efficiency e of the system. 100 kg 300 kg B 2 m/sfor an impulse turbine of de laval type, the nozzle having an angle of 16 degree ,deliver 1 kg of steam per second at a speed of 720 m/s to a set of blades moving at 180 m/s.the blade angle at outlet is 25 degree and blade velocity coefficient is 0.72. determine: 1. Power of the wheel in kilowatt. 2. Blade efficiency in Percentile (%) 3. The energy lost in the blades in kJ/kg.
- The inlet and exit temperatures of the air expanded at an adiabatic turbine are 50 Cand -30 C, respctively, while operating at a plant. The air enters the turbine with a volumetric flow rate of 25 L/s and at 450 kPa. Assume air behaves as an ideal gas with constant specific heats. Calculate the turbine power output (kW) at isentropic conditions if the turbine operates at isentropic efficiency of 75%?Steam enters a long, horizontal pipe with an inlet diameter of D1=12 cm with a velocity of 2 m/s. And out let D2=10 cm, Determine (a) the mass flow rate of the steam and (b) the rate of heat transfer Take; h1 = 3051.6 kJ/kg; h2 = 2950.4kJ/kg, v=0.25799 m3 /kgA well-insulated turbine operating at steady state is shown on the right. Steam enters at 3 MPa, 400°C, with a volumetric flow rate of 85 m³/min. Some steam is extracted from the turbine at a pressure of 0.5 MPa and a temperature of 180°C. The rest expands to a pressure of 6 kPa and a quality of 90%. The total power developed by the turbine is 11,400 kW. Kinetic and potential energy effects can be neglected. Determine (a) the mass flow rate (in kg/s) at each exit, and (b) the diameter of the duct, d₂ (in cm) where steam is extracted P₁ = 3MPa T₁=400°C (AV)₁ = 85 m³/min Turbine P2 = 0.5 MPa T₂ = 180°C V₂= 20 m/s Power out ¹3 P3= 6 kPa x3 = 90%
- Oil of specific gravity of 0.72 flows through a 7.5 cm diameter orifice withCv = 0.95, Cc = 0.65. What must be the pressure of the air on the surfaceso that the jet’s available power is 6 KW?Motor unit A is used to elevate the 300-kg, cylinder at a constant rate of 2 m/s. If the power meter B registers an electrical input of 2.10 kW, calculate the combined electrical and mechanical efficiency e of the system. 1 B 100 kg A lee 300 kg 2 m/sSteam enters a turbine at 15bar and 600°C with a rate of 0.371 kg/s. The steam expands to 0.08 bar with quality at 90%. Stray heat transfer and kinetic and potential energy effects are negligible. For operation at steady state, • the volume flowrate at the turbine outlet is m³/s, ⚫the power developed by the turbine is ⚫and the temperature at the turbine exit is kW, °C.
- Steam enters a turbine at 30 bar, 300°C (u = 2750 kJ/kg, h = 2993 kJ/kg) and exits the condenser as saturated liquid at 15 kPa (u = 225 kJ/kg. h = 226 kJ/kg). Heat loss to the surrounding is 50kJ/kg of steam flowing through the turbine. Neglecting changes in kinetic energy and potential energy, the work output of the turbine (in kJ/kg of steam) isA Pelton wheel is designed for producing a mechanical output of 12,000 kW while working under a head of 400 m and running at 750 rpm. If three jets are used for running the wheel then determine the overall efficiency of the wheel. The jet diameter is one-fifth of the wheel diameter and the speed ratio is 0.48. Assume a proper value for the coefficient of the nozzle.Argon gas flows through a well-insulated nozzle at steady state. The temperature and velocity at the inlet are 570°R and 150 ft/s, respectively. At the exit, the temperature is 460°R and the pressure is 40 lb/in². The area of the exit is 0.0085 ft². Use the ideal gas model with k = 1.67, and neglect potential energy effects. Determine the velocity at the exit, in ft/s, and the mass flow rate, in lb/s.