Air flow calculation| flow meters

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There are two main formulas for calculating the air flow rate of a car engine. The first formula: The engine air flow rate $G_ {c} $can be calculated using the following formula:$ G_{c} = frac{N_{e} cdot g_{e} cdot alpha cdot eta_{s}}{3600} cdot L_{0}$$G_{c}$： Engine air flow rate, in kg/s. $N_ {e} $: Engine power, in kW. $d_ {e} $: Fuel consumption rate, in g/(kWh). Alpha: Excess air coefficient. $eta_ {s} $: Engine scavenging coefficient. $L_{0} $: A constant related to the type of fuel, which is approximately 14.7 kg (the theoretical air mass required for complete combustion of a unit of fuel) for gasoline engines. The second formula: Engine intake flow rate can also be calculated using the following formula:$ G_{s} = frac{P_{e} cdot b_{e} cdot alpha cdot varphi_{s}}{3600} cdot L_{0}$$G_{s}$： Engine intake flow rate, in kg/s. $P_ {e} $: Engine power, in kW. $c_ {e} $: Fuel consumption rate, in g/(kW · h). Alpha: Excess air coefficient. $varphi_ {s} $: Engine scavenging coefficient. $L_{0} $: Same as above, a constant related to the type of fuel. In practical applications, it is necessary to select appropriate formulas and parameters for calculation based on factors such as the specific type, working state, and required accuracy of the engine. At the same time, these parameters may vary depending on the engine, so when calculating, it is necessary to ensure that the parameters used are consistent with the actual situation of the engine.

2. What are the methods for calculating the air flow rate of blast furnace blowers?

There are four common methods for measuring and calculating the air flow rate of blast furnace blowers, each of which is suitable for different working conditions and accuracy requirem

ents.

1 The differential pressure flowmeter measurement method works based on the Bernoulli principle. Orifice plates, Venturi tubes, and other throttling devices are installed in the air supply duct of the blower. When air flows through the throttling element, a blind pressure difference is formed between the front and rear, and the air flow rate can be calculated by measuring this pressure difference. The calculation formula is $Q=C \ times A \ times \ sqrt {\ frac {2 \ Delta P} {\ rho} $, where Q is the air flow rate, C is the flow coefficient, A is the opening area of the throttle element, Δ P is the differential pressure before and after the throttle device, and ρ is the air density. The advantage of this method is its simple structure, wide application, and mature industry standards that can be followed; The disadvantage is that it will cause pressure loss and require high requirements for the coaxiality of installation conditions, the length of the front and rear straight pipe sections, etc.

2. The velocity flowmeter measurement method calculates the total flow rate by measuring the average flow velocity of the air and combining it with the cross-sectional area of the pipeline. Common products include turbine flowmeters and vortex flowmeters. For example, a turbine flowmeter relies on the flow of air impacting the turbine blades, and the speed of the turbine is proportional to the air flow rate. By measuring the speed, the air flow rate can be derived. The calculation formula is $Q=v \ times S $, where v is the average fluid velocity and S is the cross-sectional area of the pipeline. This method has high accuracy and fast response speed, but it requires high cleanliness of the air and is not suitable for

Air flow calculation

2. What are the methods for calculating the air flow rate of blast furnace blowers?

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