AQ1 A simple carburetor is designed to supply 5 kg of air and 0.40 kg of fuel perminute to the four stroke single cylinder petrol engine. The ambient air is at 1 bar and 25 °C. (a)Calculate the throat diameter of the choke when the velocity of air is limited to 90 m/s. Take pf=740 kg/m³ and velocity coefficient = 0.8. (b) If the pressure drop near the fuel nozzle is 75% of that85at the venturi; calculate the fuel nozzle diameter. Take Car= 0.6.Q2/ For a single jet carburetor drive an expression for the air flow, fuel flow, and the air fuel ratio,take the compressibility of the air into account.QuizA simple carburetor has to supply 4 kg of air/min at a pressure of 1 bar and at thetemperature 27 °C. Calculate throat diameter of venturi, if the air flow velocity at the throat is 85m/sec and velocity coefficient 0.8.A-y=

Q1. Simple Carburetor DesignPart (a): Calculate the throat diameter of the choke:P=100,000Pa,R=287…

Answered: A Q1 A simple carburetor is designed to…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Q1/ A simple jet carburetor is required to supply 0.1 kg/s of air and 8.333x10-3 kg/s of fuel of density 780 kg/m³. The air is initially at 1.013 bar and 27 C. Assume the flow is an isentropic and compressible. The air flow velocity 80 m/s of the chock. The pressure drop across the fuel metering orifice is 0.75 of that at the chock. Calculate the throat diameter and orifice diameter? Take the velocity coefficient for the venture to be 0.8 and the coefficient of discharge of the main fuel jet to be 0.6.
minute of fuel B/ A simple jet carburetor is required to supply 5 kg of air per minute and 0.45 kg per of density 740 kg/m³. The air is initially at 1.013 bar and 25°C, take y=1.4, cp=1.005 kJ/kg.K and R=0.287 kJ/kg.K (i) Calculate the throat diameter of the choke for a flow velocity of 95 m/s. Velocity coefficient is 0.85. (ii) If the pressure drop across the fuel metering orifice is 0.75 of that at the choke, calculate the orifice diameter assuming Cd = 0.60. Mode
Answer the problem correctly and provide complete and readable solutions. If you can explain the process (briefly), please do so. Thank you!
1. From the data given below, calculate the power required to drive the compressor and stage air angles for an axial flow compressor. Stagnation temperature at the inlet: Overall pressure ratio: Isentropic efficiency of the compressor: Mean blade speed: Axial velocity: 288 K 4 0:88 170 m/s 120 m/s Degree of reaction: 0:5 A. P = 439.5 kW, B, = 77.8°, B, = 72.69° C. P = 639.5 kW, B, = 77.8°, B2 = -72.69° B. P = 539.5 kW, B, = -77.8°, B2 = 72.69° D. P = 739.5 kW, B, = -77.8°, B2 = -72.69°
last digit 5 The Snecma M88 is a French afterburning turbofan engine developed by Snecma (now known as Safran Aircraft Engines) for the Dassault Rafale fighter. The following are some preliminary design data at takeoff conditions. The engine pressure ratio 24.5, bypass ratio 0.3 and total air mass flow rate 60+last digit kg/s. Inlet diffuser: stagnation pressure ratio 0.98. Fan: pressure ratio 1.3, isentropic efficiency 0.89, first-stage hubtip diameters 0.22/0.66 m, 0.96. 1. The air inlet velocity to the fan is 150 m/s entering axially and the LP-spool rotating speed is 5000 rpm. Draw the velocity triangle and blade shapes. Calculate maximum inlet relative Mach number. Check if there is any shock formation.
Two gaseous stream enter a combining tube and leave as a single mixture. The entrance data for one of the gas, A1=75 in2, v1=500 fps, V1=10 ft3/lb; for the other gas, A2=50 in2, m2=600 lb/hr, p=0.12 lb/ft3. At exit, v3=350 fps, V3=7 ft3/lb. Find the mass flow rate (in lb/hr) at the exit section. a. 157,800 b. None of these c. 140,200 d. 153,750 e. 94,351
Q2. A four-stroke cycle SI engine with 8 cylinder has 6.2-liters. It designed to have a maximum mass flow rate of 0.349 kg/sec. The engine is equipped with a four-barrel carburetor, each barrel having a discharge coefficient of CD = 0.95. The tube discharge coefficient CDc= 0.85 and the capillary tube height differential is Icm. The fuel used is gasoline at FA = 1:15 ,density of gasoline is 750 kg/m'. Calculate the Fuel capillary tube diamețer needed for each venturi throat. %3D
Single stage, single-acting air compressor. Air delivery for this device is 30 bar at a speed of 1500 rev/min. The atmospheric condition of his location is 87 kPa and 20 ˚C, with a FAD of 0.22 m2/min. The clearance volume is 4% of the swept volume and the stoke/bore ratio is 1.3/1. Take “n” as 1.3, cp = 1.005 kJ/kg K, cv = 0.718 kJ/kg KW 1.What is the isothermal power of the compressor in kW to 2 decimal places in kW? 2. which formula will be used to evaluate the isothermal efficiency? 3. which formula will be used to evaluate the delivery volume? 4. What is the induced volume in terms of stroke volume, provide the coefficient values of the swept volume to 4 decimal places?
You have been asked to help with the low-pressure compressor (LPC) design for a turbofan engine with a bypass ratio of 8.4. The preliminary cycle design calls for the LPC to produce a pressure ratio of 9.4 with the following operating conditions and constraints. .Inlet Conditions TO2 Poz Core Air Mass Flowrate (kg/s) (K) (kPa) 282 24.6 47.0 Design Constraints Maximum Polytropic Efficiency 94.1% Maximum Stage Pr 1.55 Estimate the minimum number of stages required for this LPC. Then assuming the 1st stage of the LPC operates at the maximum allowable pressure ratio, determine the stagnation temperature exiting the 1st stage, and the stage's adiabatic efficiency. Also determine the power (W) required to operate the full LPC (not just 1st stage). Finally, what would be the percent change in the required power if the polytropic efficiency was only 90.0%.
Divided chamber diesel engines use lower injection pressures compared to open chamber enginesbecause (a) Pintle nozzles cannot withstand high injection pressures (b) High air swirl does not require high injection pressures for atomization (c) High injection pressures may cause over-penetration (d) High injection pressure causes leakage of the fuel at the pintle
Fast fast fast
(a) Chevrolet Silverado 6.2-liter, V8, four-stroke cycle SI engine is designed to have a maximum speed of 6500 RPM. At this speed, volumetric efficiency is 88%. The engine is equipped with a four-barrel carburetor, each barrel having a discharge coefficient of CD, = 0.95. The fuel used is gasoline at AF = 15:1 with a density of 750 kg/m. Determine: (i) Minimum throat diameter needed in each carburetor venturi. (ii) Fuel capillary tube diameter needed for each venturi throat.

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