The new VECTRA 40 modular design improves serviceability
while reducing downtime. The VECTRA power turbine can be installed and removed as a unit, either separate
from, or with the gas generator. These design advantages will produce significant
operational savings to the customer over the extended life cycle of the power turbine.
VECTRA power
design features include:
- Two-stage overhung rotor
- Rolling element bearings
- Center tie and curvic couplings
In addition, Dresser-Rand will optionally package new equipment with a Dry Low
Emissions (DLE) combustion system to reduce the amount of NOx, CO and unburned
hydrocarbons when burning natural gas fuel.
| VECTRA 40
Performance Summary |
| Design Speed: |
6,200 RPM |
| Maximum Continuous Speed: |
6,500 RPM |
| Power:
|
40,200 HP 30,000 KW |
| Efficiency: |
39.9% |
| Mass Flow: |
180 lbs/sec |
|
The DR-61 was developed as an efficient, cost-effective, and
reliable power turbine for the GE LM2500 gas generator. The DR-61 is an
industrial, heavy duty, mechanical drive turbine with an output shaft design
speed of 5500 rpm. The LM2500 is an industrial derivative of the CF6 high
efficiency turbofan engine installed on wide body commercial aircraft.
The DR-61 is a two-stage power turbine that is bolted
rigidly to the LM2500. The resulting short power turbine inlet diffuser
reduces the total pressure loss and improves overall efficiency. To avoid
thermal distortion, which can lower efficiency, all turbine casing
components are symmetrical, unsplit rings from the gas generator discharge
to the power turbine diffuser exhaust.
The two-stage rotor has cooled discs and tip shrouded
blades for durability. In addition, the tip shrouds run against abradable
honeycomb seals in the casing to minimize leakage and improve efficiency.
All elements of the rotor have been designed for a creep life of over
100,000 hours at full load. The materials utilized are modern super-alloys
specifically developed for service at the temperatures encountered.
The power turbine shaft is designed to insure the first
bending critical speed of the rotor is well above the maximum operating
speed. The shaft is supported in two tilting pad journal bearings. A tilting
shoe thrust bearing in mounted in the same housing as the aft journal
bearing.
An optional shaft driven accessory gearbox can be provided
which is bolted to the coupling end on the bearing housing. The gearbox has
three shafts that can be used for oil pumps or other accessory drives.
The DR-61 package can be supplied with either a standard
combustion system or a GE Dry Low Emissions system designed to reduce the
amount of NOx, CO, and unburned hydrocarbons in the exhaust.
DR-61 Design Summary
Package
- GE LM2500 gas generator
- DLE or standard package
Power Turbine
- Heavy duty industrial design
- Oil film bearings
- Two-stage overhung rotor
- Tip shrouded blades
- Design life of 100,000 hours
| DR-61
Performance Summary |
| Design Speed: |
5,500 RPM |
| Maximum Continuous Speed: |
5,775 RPM |
| Power:
|
31,000 HP 23,100 KW |
| Efficiency: |
37.5% |
The VECTRA 40 power turbine was developed to match with the
GE LM2500+ gas generator. Together, they offer the most effective power package available
for high-speed operation. As part of a complete package with the GE LM2500+, the VECTRA
turbine has an ISO rating of 40,200 horsepower (30 megawatts). Thermal
efficiency is 39.9 percent at full load, with a corresponding mass flow to 180 pounds per second. The VECTRA
40 has a maximum continuous operating speed of 6,500 RPM. It is the highest speed
power turbine available for the GE LM2500+.
