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Turbine extension proportion and turbine channel remedied temperature ... Turbine extension proportion and turbine delta adjusted temperature decide compressor ...

Stream Engine Operation As An Integrated System INME5702 Class 13

Agenda for Class 13 Develop the Model for the Two-Spool Turbojet.

Two-Spool Turbojet – Model Schematic Internal Shaft External Shaft Front Compressor (LPC) Rear Turbine (LPT) Internal Compressor (HPC) Internal Turbine (HPT) Inlet Nozzle * Burner * 4 3 * 8 0 2.5 4.5 5 2 * ~ Choked Flow Blue ~ Added to SSTJ

Twin-Spool Turbojet h-s Diagram P 4 h P 3 4.5 5 2.5 8 P Amb 2 s

Why Two Spools ? Essential reason is to advance the pressure procedure. Pressure is the most troublesome streamlined test in the gas turbine motor. A similar weight change must happen over numerous a larger number of stages in pressure than in turbine development because of the expanded dangers of limit layer develop and stream division in the compressor.

Air Velocity Out Air Velocity In N INPUT SHAFT TORQUE Why Two Spools ? Compressor execution is subject to (among different parameters) the proportion of pivotal speed to unrelated speed in the phases of the compressor V x/U Tangential speed, U, is relative to wheel speed, N. Execution can be enhanced over the phases of a compressor by restricting the variety of V x/U. "Part" the compressor into two separate machines permits enhanced control over the scope of V x/U inside every compressor ( 2 estimations of N accessible as opposed to 1 ). The outcome is enhanced pressure execution.

What Are The Differences Between The Single-Spool and Two-Spool Turbojet ? There is no new material science, i.e., no new major connections. Two new segments are included, the LPC and the LPT. Each has its own particular effectiveness. One new stifling plane is included between the turbines ( Station 4.5 ). The HPT keeps on working between gagged planes, now A4 and A45 rather than A4 and A8. The LPT likewise works between stifled planes, A45 and A8. The HPC gulf is currently station 2.5 rather than 2.0.

High-Pressure Spool Nomograph Equations

Consider the Control Volumes That Defined Constraints for the SSTJ Has anything changed ( other than station numbering ) ? Interior Shaft External Shaft Front Compressor (LPC) Rear Turbine (LPT) Internal Turbine (HPT) Internal Compressor (HPC) Inlet Nozzle * Burner * 4 3 * 8 0 2.5 4.5 5 2 * ~ Choked Flow Blue ~ Added to SSTJ

Consider the Control Volumes That Defined Constraints for the SSTJ Has anything changed ( other than station numbering ) ? The answer is "No." The High-Pressure Spool of the TSTJ matches utilizing an indistinguishable standards from the SSTJ. Would you be able to express these standards ?

Consider the Control Volumes That Defined Constraints for the SSTJ Has anything changed ( other than station numbering ) ? The answer is "No." The High-Pressure Spool of the TSTJ matches utilizing an indistinguishable standards from the SSTJ. Would you be able to express these standards ? Turbine region proportion decides turbine development proportion ( turbine effectiveness has a moment arrange impact ).

Consider the Control Volumes That Defined Constraints for the SSTJ Has anything changed ( other than station numbering ) ? The answer is "No." The High-Pressure Spool of the TSTJ matches utilizing an indistinguishable standards from the SSTJ. Would you be able to express these standards ? Turbine range proportion decides turbine extension proportion ( turbine effectiveness has a moment arrange impact ). Turbine development proportion and turbine delta remedied temperature decide compressor adjusted work ( since compressor work squares with turbine work ).

Consider the Control Volumes That Defined Constraints for the SSTJ Has anything changed ( other than station numbering ) ? The answer is "No." The High-Pressure Spool of the TSTJ matches utilizing an indistinguishable standards from the SSTJ. Would you be able to express these standards ? Turbine zone proportion decides turbine development proportion ( turbine proficiency has a moment arrange impact ). Turbine development proportion and turbine gulf redressed temperature decide compressor adjusted work ( since compressor work approaches turbine work ). Compressor revised work and compressor effectiveness decide compressor weight proportion.

Consider the Control Volumes That Defined Constraints for the SSTJ Has anything changed ( other than station numbering ) ? The answer is "No." The High-Pressure Spool of the TSTJ matches utilizing an indistinguishable standards from the SSTJ. Would you be able to express these standards ? Turbine zone proportion decides turbine development proportion ( turbine proficiency has a moment arrange impact ). Turbine development proportion and turbine delta revised temperature decide compressor remedied work ( since compressor work breaks even with turbine work ). Compressor rectified work and compressor effectiveness decide compressor weight proportion. Compressor weight proportion and turbine gulf redressed temperature decide compressor channel rectified stream ( with FP4, ( D P/P) Burner , and A4 as parameters ).

These Principles Describe the Nomograph for the SSTJ ( or the High-Pressure Spool of the TSTJ ) Turbine zone proportion decides turbine extension proportion ( turbine proficiency has a moment arrange impact ). Turbine extension proportion and turbine gulf revised temperature decide compressor amended work ( since compressor work meets turbine work ). Compressor redressed work and compressor proficiency decide compressor weight proportion. Compressor weight proportion and turbine bay adjusted temperature decide compressor bay remedied stream ( with FP4, ( D P/P) Burner , and A4 as parameters ).

TSTJ High-Spool Matching With Nomographs 4. W C25 - FP4 Continuity 2. HPC/HPT Energy Balance Finish h HPT 3. HPC Efficiency h HPT 1. Gagged FP4, FP45, HPT Efficiency Start

Low-Pressure Spool Nomograph Equations Turbine Expansion Ratio – Turbine Area Ratio Choked Inlet/Exit and Turbine Efficiency Compressor – Turbine Energy Balance Compressor Pressure Ratio – Input Work Compressor Efficiency Compressor Pressure Ratio – Corrected Flow Continuity

Combine Choked-Flow Equation with Turbine Efficiency To Get Turbine Expansion Ratio as f ( A8/A45 ) * Low Spool Nomograph # 1

Compare Analogous Relationships for High and Low Spools Expansion Ratio – Area Ratio Relationship Any distinction as these conditions ? Low Spool High Spool

Compare Analogous Relationships for High and Low Spools Expansion Ratio – Area Ratio Relationship Any distinction as these conditions ? Low Spool High Spool Constants

Compressor/Turbine Energy Balance Relates Compressor Work to Turbine Expansion Ratio * Low Spool Nomograph # 2

Compare Analogous Relationships for High and Low Spools Compressor – Turbine Work Balance Any distinction as these conditions ? Low Spool High Spool

Compare Analogous Relationships for High and Low Spools Compressor – Turbine Work Balance What about T45/Q 25 ? Low Spool High Spool Constants Specified as the power setting

Compare Analogous Relationships for High and Low Spools Compressor – Turbine Work Balance Inlet temperature to the LPT relies on upon HPT yield !!! Low Spool High Spool Constants Specified as the power setting

LPT Inlet Temperature Depends on Both HPT Efficiency and HPT Expansion Ratio Low Spool Nomograph # 2a

Compressor Efficiency Relates Compressor Work to Compressor Pressure Ratio

Compressor Efficiency Relates Compressor Work to Compressor Pressure Ratio Low Spool Nomograph # 3

Compare Analogous Relationships for High and Low Spools Compressor Pressure Ratio – Input Work Relationship Any distinction as these conditions ? Low Spool High Spool

Continuity Equation Relates Compressor Pressure Ratio to Compressor Inlet Corrected Flow *

Continuity Equation Relates Compressor Pressure Ratio to Compressor Inlet Corrected Flow Low Spool Nomograph # 4

Compare Analogous Relationships for High and Low Spools Low Spool High Spool

Compare Analogous Relationships for High and Low Spools Low Spool LPC Pressure Ratio is identified with LPC Inlet Corrected Flow by LPC Efficiency and HPC Inlet Corrected Flow. High Spool HPC Pressure Ratio is identified with HPC Inlet Corrected Flow by T4/Q 25, FP4, A4, and ( D P/P)Burner.

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